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</style><table class="sidebar nomobile nowraplinks hlist"><tbody><tr><td class="sidebar-pretitle">Part of a series on</td></tr><tr><th class="sidebar-title-with-pretitle"><a href="Online_advertising" title="Online advertising">Internet marketing</a></th></tr><tr><td class="sidebar-content">

<ul><li><a href="Search_engine_optimization" title="Search engine optimization">Search engine optimization</a></li>

<li><a href="Local_search_engine_optimisation" title="Local search engine optimisation">Local search engine optimisation</a></li>

<li><a href="Social_media_marketing" title="Social media marketing">Social media marketing</a></li>

<li><a href="Email_marketing" title="Email marketing">Email marketing</a></li>

<li><a href="Referral_marketing" title="Referral marketing">Referral marketing</a></li>

<li><a href="Content_marketing" title="Content marketing">Content marketing</a></li>

<li><a href="Native_advertising" title="Native advertising">Native advertising</a></li></ul></td>

</tr><tr><th class="sidebar-heading" style="background:#ddddff;">

<a href="Search_engine_marketing" title="Search engine marketing">Search engine marketing</a></th></tr><tr><td class="sidebar-content">

<ul><li><a href="Pay-per-click" title="Pay-per-click">Pay-per-click</a></li>

<li><a href="Cost_per_impression" title="Cost per impression">Cost per impression</a></li>

<li><a href="Search_analytics" title="Search analytics">Search analytics</a></li>

</ul></td>

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<a href="Display_advertising" class="mw-redirect" title="Display advertising">Display advertising</a></th></tr><tr><td class="sidebar-content">

<ul><li><a href="Ad_blocking" title="Ad blocking">Ad blocking</a></li>

<li><a href="Contextual_advertising" title="Contextual advertising">Contextual advertising</a></li>

<li><a href="Behavioral_targeting" class="mw-redirect" title="Behavioral targeting">Behavioral targeting</a></li>

<li><a href="Mobile_advertising" title="Mobile advertising">Mobile advertising</a></li></ul></td>

</tr><tr><th class="sidebar-heading" style="background:#ddddff;">

<a href="Affiliate_marketing" title="Affiliate marketing">Affiliate marketing</a></th></tr><tr><td class="sidebar-content">

<ul><li><a href="Cost_per_action" title="Cost per action">Cost per action</a></li>

<li><a href="Revenue_sharing" title="Revenue sharing">Revenue sharing</a></li></ul></td>

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Misc</th></tr><tr><td class="sidebar-content">

<ul><li><a href="Keyword_density" title="Keyword density">Keyword density</a></li>

<li><a href="Keyword_research" title="Keyword research">Keyword research</a></li>

<li><a href="PageRank" title="PageRank">PageRank</a></li>

<li><a href="WordPress" title="WordPress">WordPress CMS</a></li></ul></td>

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<p><b>Web analytics</b> is the measurement, <a href="Data_collection" title="Data collection">collection</a>, <a href="Analysis" title="Analysis">analysis</a>, and reporting of web <a href="Data_(computing)" class="mw-redirect" title="Data (computing)">data</a> to understand and optimize <a href="Web_usage" class="mw-redirect" title="Web usage">web usage</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Web analytics is not just a process for measuring <a href="Web_traffic" title="Web traffic">web traffic</a> but can be used as a tool for business and <a href="Market_research" title="Market research">market research</a> and assess and improve <a href="Website" title="Website">website</a> effectiveness. Web analytics applications can also help companies measure the results of traditional print or <a href="Broadcasting" title="Broadcasting">broadcast</a> <a href="Advertising_campaign" title="Advertising campaign">advertising campaigns</a>. It can be used to estimate how traffic to a website changes after launching a new advertising campaign. Web analytics provides information about the number of visitors to a <a href="Website" title="Website">website</a> and the number of page views, or creates user behaviour profiles.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> It helps gauge traffic and popularity trends, which is useful for market research.

</p>

<div class="mw-heading mw-heading2"><h2 id="Basic_steps_of_the_web_analytics_process">Basic steps of the web analytics process</h2></div>

<p>Most web analytics processes come down to four essential stages or steps,<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> which are:

</p>

<ul><li><a href="Data_collection" title="Data collection">Collection of data</a>: This stage is the collection of the basic, elementary data. Usually, these data are counts of things. The objective of this stage is to gather the data.</li>

<li>Processing of data into <a href="Metric_(disambiguation)" class="mw-redirect mw-disambig" title="Metric (disambiguation)">metrics</a>: This stage usually takes counts and makes them ratios, although there still may be some counts. The objective of this stage is to take the data and conform it into information, specifically metrics.</li>

<li>Developing KPI: This stage focuses on using the ratios (and counts) and infusing them with business strategies, referred to as <a href="Key_performance_indicators" class="mw-redirect" title="Key performance indicators">key performance indicators</a> (KPI). Many times, KPIs deal with conversion aspects, but not always. It depends on the organization.</li>

<li>Formulating online strategy: This stage is concerned with the online goals, objectives, and standards for the organization or business. These strategies are usually related to making a <a href="Profit_maximization" title="Profit maximization">profit</a>, <a href="Cost_reduction" title="Cost reduction">saving money</a>, or increasing <a href="Market_share" title="Market share">market share</a>.</li></ul>

<p>Another essential function developed by the analysts for the optimization of the websites is the experiments:

</p>

<ul><li>Experiments and testing: <a href="A/B_testing" title="A/B testing">A/B testing</a> is a controlled experiment with two variants, in online settings, such as <a href="Web_development" title="Web development">web development</a>.</li></ul>

<p>The goal of A/B testing is to identify and suggest changes to web pages that increase or maximize the effect of a statistically tested result of interest.

</p><p>Each stage impacts or can impact (i.e., drives) the stage preceding or following it. So, sometimes the data that is available for collection impacts the online strategy. Other times, the online strategy affects the data collected.

</p>

<div class="mw-heading mw-heading3"><h3 id="Web_analytics_Categories">Web analytics Categories</h3></div>

<p>There are at least two categories of web analytics, <i>off-site</i> and <i>on-site</i> web analytics.

</p>

<ul><li><b><a href="#Off-site_web_analytics">Off-site web analytics</a></b> refers to web measurement and analysis regardless of whether a person owns or maintains a website. It includes the measurement of a website's <i>potential</i> audience (opportunity), share of voice (visibility), and buzz (comments) that is happening on the <a href="Internet" title="Internet">Internet</a> as a whole.</li>

<li><b><a href="#On-site_web_analytics">On-site web analytics</a></b>, the more common of the two, measures a visitor's behaviour once <i>on a specific website</i>. This includes its drivers and conversions; for example, the degree to which different <a href="Landing_page" title="Landing page">landing pages</a> are associated with online purchases. On-site web analytics measures the performance of a specific website in a commercial context. This data is typically compared against <a href="Key_performance_indicators" class="mw-redirect" title="Key performance indicators">key performance indicators</a> for performance and is used to improve a website or <a href="Marketing_campaign" class="mw-redirect" title="Marketing campaign">marketing campaign</a>'s audience response. <a href="Google_Analytics" title="Google Analytics">Google Analytics</a> and <a href="Adobe_Analytics" class="mw-redirect" title="Adobe Analytics">Adobe Analytics</a> are the most widely used on-site web analytics service; although new tools are emerging that provide additional layers of information, including <a href="Heat_map" title="Heat map">heat maps</a> and <a href="Session_replay" title="Session replay">session replay</a>.</li></ul>

<p>In the past, web analytics has been used to refer to on-site visitor measurement. However, this meaning has become blurred, mainly because vendors are producing tools that span both categories. Many different vendors provide on-site <a href="List_of_web_analytics_software" title="List of web analytics software">web analytics software</a> and <a href="List_of_web_analytics_software#Hosted_.2F_Software_as_a_service" title="List of web analytics software">services</a>. There are two main technical ways of collecting the data. The first and traditional method, <i>server log file analysis</i>, reads the <a href="Server_log" class="mw-redirect" title="Server log">logfiles</a> in which the <a href="Web_server" title="Web server">web server</a> records file requests by browsers. The second method, <i><a href="Tag_(metadata)" title="Tag (metadata)">page tagging</a></i>, uses <a href="JavaScript" title="JavaScript">JavaScript</a> embedded in the webpage to make image requests to a third-party analytics-dedicated server, whenever a webpage is rendered by a <a href="Web_browser" title="Web browser">web browser</a> or, if desired, when a mouse click occurs. Both collect data that can be processed to produce web traffic reports.

</p>

<div class="mw-heading mw-heading4"><h4 id="On-site_web_analytics">On-site web analytics</h4></div>

<p>There are no globally agreed definitions within web analytics as the industry bodies have been trying to agree on definitions that are useful and definitive for some time, that is saying, metrics in tools and products from different companies may have different ways to measure, counting, as a result, a same metric name may represent the different meaning of data. The main bodies who have had input in this area have been the IAB (Interactive Advertising Bureau), <a href="JICWEBS" title="JICWEBS">JICWEBS</a> (The Joint Industry Committee for Web Standards in the UK and Ireland), and The DAA (Digital Analytics Association), formally known as the WAA (Web Analytics Association, US). However, many terms are used in consistent ways from one major analytics tool to another, so the following list, based on those conventions, can be a useful starting point:

</p>

<ul><li><b><a href="Bounce_Rate" class="mw-redirect" title="Bounce Rate">Bounce rate</a></b> - The percentage of visits that are single-page visits and without any other interactions (clicks) on that page. In other words, a single click in a particular session is called a bounce. A high bounce rate can indicate that the content or user experience needs improvement.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></li>

<li><b><a href="Click_path" title="Click path">Click path</a></b> - the chronological sequence of page views within a visit or session. Analysis of this path provides information about users' session goals and user goals.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></li>

<li><b><a href="Hit_(internet)" class="mw-redirect" title="Hit (internet)">Hit</a></b> - A request for a file from the webserver. Available only in log analysis. The number of hits received by a website is frequently cited to assert its popularity, but this number is extremely misleading and dramatically overestimates popularity. A single web page typically consists of multiple (often dozens) discrete files, each of which is counted as a hit as the page is downloaded, so the number of hits is an arbitrary number more reflective of the complexity of individual pages on the website than the website's actual popularity. The total number of visits or page views provides a more realistic and accurate assessment of popularity.</li>

<li><b><a href="Page_view" class="mw-redirect" title="Page view">Page view (pageview)</a></b> - A request for a file, or sometimes an event such as a mouse click, that is defined as a page in the setup of the web analytics tool. Usually, the number of page views is more than Visits and Visitors (Unique Visitors). An occurrence of the script being run in page tagging. In log analysis, a single page view may generate multiple hits as all the resources required to view the page (images, .js and .css files) are also requested from the web server. A "refresh" of the same webpage can be counted as another pageview. For example, at time: 16:07, the user viewed page A, and 2 seconds later, the user clicked the "refresh" button in the browser, and the number of page views of page A then was 2.</li>

<li><b><a href="Unique_user" title="Unique user">Visitor/unique visitor/unique user</a></b> - The uniquely identified client that is generating page views or hits within a defined time (e.g. day, week or month). A uniquely identified client is usually a combination of a machine (one's desktop computer at work for example) and a browser (Firefox on that machine). The identification is usually via a persistent cookie that has been placed on the computer by the site page code. An older method, used in log file analysis, is the unique combination of the computer's IP address and the User-Agent (browser) information provided to the web server by the browser. The "Visitor" is not the same as the human being sitting at the computer at the time of the visit, since an individual human can use different computers or, on the same computer, can use different browsers, and will be seen as a different visitor in each circumstance. Increasingly, but still, somewhat rarely, visitors are uniquely identified by Flash LSO's (<a href="Local_Shared_Object" class="mw-redirect" title="Local Shared Object">Local Shared Objects</a>), which are less susceptible to privacy enforcement.</li>

<li><b><a href="Visit_filter" class="mw-redirect" title="Visit filter">Visit/session</a></b> - A visit or session is defined as a series of page requests or, in the case of tags, image requests from the same uniquely identified client. Usually, the number of Visits is more than Visitors (Unique Visitors). A unique client is commonly identified by an IP address or a unique ID that is placed in the browser cookie. A visit is considered ended when no requests have been recorded in some number of elapsed minutes. A 30-minute limit ("time out") is used by many analytics tools but can, in some tools (such as <a href="Google_Analytics" title="Google Analytics">Google Analytics</a> and <a href="Plausible_Analytics" title="Plausible Analytics">Plausible Analytics</a>), be changed to another number of minutes. Analytics data collectors and analysis tools have no reliable way of knowing if a visitor has looked at other sites between page views; a visit is considered one visit as long as the events (page views, clicks, whatever is being recorded) are 30 minutes or less close together. A visit can consist of a one-page view or thousands. A unique visit session can also be extended if the time between page loads indicates that a visitor has been viewing the pages continuously.</li>

<li><b>Active time/engagement time</b> - Average amount of time that visitors spend interacting with content on a web page, based on mouse moves, clicks, hovers, and scrolls. Unlike session duration and page view duration/time on page, this metric <b>can</b> accurately measure the length of engagement in the final page view, but it is not available in many analytics tools or data collection methods.</li>

<li><b>Average page depth/page views per average session</b> - Page depth is the approximate "size" of an average visit, calculated by dividing the total number of page views by the total number of visits.</li>

<li><b>Average page view duration</b> - Average amount of time that visitors spend on an average page of the site.</li>

<li><b>Click</b> - "refers to a single instance of a user following a hyperlink from one page in a site to another".</li>

<li><b>Event</b> - A discrete action or class of actions that occur on a website. A page view is a type of event. Events also encapsulate clicks, form submissions, keypress events, and other client-side user actions.</li>

<li><b>Exit rate/% exit</b> - A statistic applied to an individual page, not a website. The percentage of visits seeing a page where that page is the final page viewed in the visit.</li>

<li><b>Data Segmentation</b> - Web analytics tools allow data segmentation, which means breaking down data into smaller subsets based on criteria such as demographics, location, or behaviour. This provides a deeper understanding of different audience segments.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></li>

<li><b>First visit/first session</b> - (also called 'Absolute Unique Visitor' in some tools) A visit from a uniquely identified client that has theoretically not made any previous visits. Since the only way of knowing whether the uniquely identified client has been to the site before is the presence of a <a href="Persistent_cookie" class="mw-redirect" title="Persistent cookie">persistent cookie</a> or via <a href="Device_fingerprint" title="Device fingerprint">digital fingerprinting</a> that had been received on a previous visit, the <i>First Visit</i> label is not reliable if the site's cookies have been deleted since their previous visit.</li>

<li><b>Frequency/session per unique</b> - Frequency measures how often visitors come to a website in a given period. It is calculated by dividing the total number of sessions (or visits) by the total number of unique visitors during a specified period, such as a month or year. Sometimes it is used interchangeably with the term "loyalty."</li>

<li><b>Impression</b> - The most common definition of <i>impression</i> is an instance of an advertisement appearing on a viewed page. An advertisement can be displayed on a viewed page below the area displayed on the screen, so most measures of impressions do not necessarily mean an advertisement has been viewable.</li>

<li><b>New visitor</b> - A visitor that has not made any previous visits. This definition creates a certain amount of confusion (see common confusion below), and is sometimes substituted with an analysis of first visits.</li>

<li><b>Page time viewed/page visibility time/page view duration</b> - The time a single page (or a blog, ad banner) is on the screen, measured as the calculated difference between the time of the request for that page and the time of the next recorded request. If there is no next recorded request, then the viewing time of that instance of that page is not included in the reports.</li>

<li><b>Repeat visitor</b> - A visitor that has made at least one previous visit. The period between the last and current visit is called visitor recency and is measured in days.</li>

<li><b>Return visitor</b> - A unique visitor with activity consisting of a visit to a site during a reporting period and where the unique visitor visited the site before the reporting period. The individual is counted only once during the reporting period.</li>

<li><b>Session duration/visit duration</b> - Average amount of time that visitors spend on the site each time they visit. It is calculated as the total of the duration of all the sessions divided by the total number of sessions. This metric can be complicated by the fact that analytics programs can not measure the length of the final page view.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup></li>

<li><b>Single page visit/singleton</b> - A visit in which only a single page is viewed (this is not a 'bounce').</li>

<li><b>Site overlay</b> is a report technique in which statistics (clicks) or hot spots are superimposed, by physical location, on a visual snapshot of the web page.</li>

<li><b>Click-through rate</b> is the ratio of users who click on a specific link to the number of total users who view a page, email, or advertisement. It is commonly used to measure the success of an online advertising campaign for a particular website as well as the effectiveness of email campaigns. Another "commonly known" definition of <a href="Click-through_rate" title="Click-through rate">click-through rate (CTR)</a> is the total numbers clicked divided by the total number of Impressions, as the metric of Click-Through Rate is to measure the ratio of clicks and impressions, <b>not</b> the number of users (who clicked and saw).</li></ul>

<div class="mw-heading mw-heading4"><h4 id="Off-site_web_analytics">Off-site web analytics</h4></div>

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</style><div role="note" class="hatnote navigation-not-searchable">See also: <a href="Keyword_research" title="Keyword research">Keyword research</a> and <a href="Targeted_advertising" title="Targeted advertising">Targeted advertising</a></div>

<p>Off-site web analytics is based on open data analysis, <a href="Social_media" title="Social media">social media</a> exploration, and share of voice on web properties.

It is usually used to understand how to market a site by identifying the keywords tagged to this site, either from social media or from other websites.

</p>

<div class="mw-heading mw-heading3"><h3 id="Web_analytics_data_sources">Web analytics data sources</h3></div>

<p>The fundamental goal of web analytics is to collect and analyze data related to web traffic and usage patterns. The data mainly comes from four sources:<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p>

<ol><li>Direct <a href="HTTP_request" class="mw-redirect" title="HTTP request">HTTP request</a> data: directly comes from HTTP request messages (HTTP request headers).</li>

<li>Network-level and server-generated data associated with HTTP requests: not part of an HTTP request, but it is required for successful request transmissions - for example, the <a href="IP_address" title="IP address">IP address</a> of a requester.</li>

<li>Application-level data sent with HTTP requests: generated and processed by application-level programs (such as <a href="JavaScript" title="JavaScript">JavaScript</a>, <a href="PHP" title="PHP">PHP</a>, and <a href="ASP.Net" class="mw-redirect" title="ASP.Net">ASP.Net</a>), including sessions and referrals. These are usually captured by internal logs rather than public web analytics services.</li>

<li>External data: can be combined with on-site data to help augment the website behaviour data described above and interpret web usage. For example, IP addresses are usually associated with Geographic regions and internet service providers, e-mail open and <a href="Click-through_rate" title="Click-through rate">click-through rates</a>, direct mail campaign data, sales, lead history, or other data types as needed.</li></ol>

<div class="mw-heading mw-heading3"><h3 id="Web_server_log_file_analysis">Web server log file analysis</h3></div>

<p><a href="Web_server" title="Web server">Web servers</a> records some of their transactions in a log file. It was soon realized that these log files could be read by a program to provide data on the popularity of the website. Thus arose <a href="Web_log_analysis_software" title="Web log analysis software">web log analysis software</a>.

</p><p>In the early 1990s, website statistics consisted primarily of counting the number of client requests (or <i>hits</i>) made to the web server. This was a reasonable method initially since each website often consisted of a single HTML file. However, with the introduction of images in HTML, and websites that spanned multiple HTML files, this count became less useful. The first true commercial Log Analyzer was released by IPRO in 1994.<sup id="cite_ref-web-data-sources_9-0" class="reference"><a href="#cite_note-web-data-sources-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>

</p><p>Two units of measure were introduced in the mid-1990s to gauge more accurately the amount of human activity on web servers. These were <i>page views</i> and <i>visits</i> (or <i>sessions</i>). A <i><a href="Page_view" class="mw-redirect" title="Page view">page view</a></i> was defined as a request made to the web server for a page, as opposed to a graphic, while a <i>visit</i> was defined as a sequence of requests from a uniquely identified client that expired after a certain amount of inactivity, usually 30 minutes.

</p><p>The emergence of <a href="Web_crawler" title="Web crawler">search engine spiders</a> and robots in the late 1990s, along with <a href="Proxy_server" title="Proxy server">web proxies</a> and <a href="Dynamic_Host_Configuration_Protocol" title="Dynamic Host Configuration Protocol">dynamically assigned IP addresses</a> for large companies and <a href="Internet_service_provider" title="Internet service provider">ISPs</a>, made it more difficult to identify unique human visitors to a website. Log analyzers responded by <a href="Web_tracking" title="Web tracking">tracking</a> visits by <a href="HTTP_cookie" title="HTTP cookie">cookies</a>, and by ignoring requests from known spiders.

</p><p>The extensive use of <a href="Web_cache" title="Web cache">web caches</a> also presented a problem for log file analysis. If a person revisits a page, the second request will often be retrieved from the browser's cache, so no request will be received by the web server. This means that the person's path through the site is lost. Caching can be defeated by configuring the web server, but this can result in degraded performance for the visitor and a bigger load on the servers.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Page_tagging">Page tagging</h3></div>

<p>Concerns about the accuracy of log file analysis in the presence of caching, and the desire to be able to perform web analytics as an outsourced service, led to the second data collection method, page tagging or "<a href="Web_beacon" title="Web beacon">web beacons</a>".

</p><p>In the mid-1990s, <a href="Web_counter" title="Web counter">Web counters</a> were commonly seen — these were images included in a web page that showed the number of times the image had been requested, which was an estimate of the number of visits to that page. In the late 1990s, this concept evolved to include a small invisible image instead of a visible one, and, by using JavaScript, to pass along with the image request certain information about the page and the visitor. This information can then be processed remotely by a web analytics company, and extensive statistics generated.

</p><p>The web analytics service also manages the process of assigning a cookie to the user, which can uniquely identify them during their visit and in subsequent visits. Cookie acceptance rates vary significantly between websites and may affect the quality of data collected and reported.

</p><p>Collecting website data using a third-party data collection server (or even an in-house data collection server) requires an additional <a href="Domain_Name_System" title="Domain Name System">DNS</a> lookup by the user's computer to determine the IP address of the collection server. On occasion, delays in completing successful or failed DNS lookups may result in data not being collected.

</p><p>With the increasing popularity of <a href="Ajax_(programming)" title="Ajax (programming)">Ajax</a>-based solutions, an alternative to the use of an invisible image is to implement a call back to the server from the rendered page. In this case, when the page is rendered on the web browser, a piece of JavaScript code would call back to the server and pass information about the client that can then be aggregated by a web analytics company.

</p>

<div class="mw-heading mw-heading3"><h3 id="Logfile_analysis_vs_page_tagging">Logfile analysis vs page tagging</h3></div>

<p>Both logfile analysis programs and page tagging solutions are readily available to companies that wish to perform web analytics. In some cases, the same web analytics company will offer both approaches. The question then arises of which method a company should choose. There are advantages and disadvantages to each approach.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading4"><h4 id="Advantages_of_logfile_analysis">Advantages of logfile analysis</h4></div>

<p>The main advantages of log file analysis over page tagging are as follows:

</p>

<ul><li>The web server normally already produces log files, so the raw data is already available. No changes to the website are required.</li>

<li>The data is on the company's servers and is in a standard, rather than a proprietary, format. This makes it easy for a company to switch programs later, use several different programs, and analyze historical data with a new program.</li>

<li>Log files contain information on visits from search engine spiders, which generally are excluded from the analytics tools using JavaScript tagging. (Some search engines might not even execute JavaScript on a page.) Although these should not be reported as part of human activity, it is useful information for <a href="Search_engine_optimization" title="Search engine optimization">search engine optimization</a>.</li>

<li>Log files require no additional <a href="Domain_Name_System" title="Domain Name System">DNS</a> lookups or <a href="TCP_congestion_control#Slow_start" title="TCP congestion control">TCP slow starts</a>. Thus there are no external server calls that can slow page load speeds, or result in uncounted page views.</li>

<li>The web server reliably records every transaction it makes, e.g. serving PDF documents and content generated by scripts, and does not rely on the visitors' browsers cooperating.</li></ul>

<div class="mw-heading mw-heading4"><h4 id="Advantages_of_page_tagging">Advantages of page tagging</h4></div>

<p>The main advantages of page tagging over log file analysis are as follows:

</p>

<ul><li>Counting is activated by opening the page (given that the web client runs the tag scripts), not requesting it from the server. If a page is cached, it will not be counted by server-based log analysis. Cached pages can account for up to one-third of all page views, which can negatively impact many site metrics.</li>

<li>Data is gathered via a component ("tag") in the page, usually written in JavaScript. It is typically used in conjunction with a server-side scripting language (such as <a href="PHP" title="PHP">PHP</a>) to manipulate and (usually) store it in a database.</li>

<li>The script may have access to additional information on the web client or the user, not sent in the query, such as visitors' screen sizes and the price of the goods they purchased.</li>

<li>Page tagging can report on events that do not involve a request to the web server, such as interactions within <a href="Adobe_Flash" title="Adobe Flash">Flash</a> movies, partial form completion, mouse events such as onClick, onMouseOver, onFocus, onBlur, etc.</li>

<li>The page tagging service manages the process of assigning cookies to visitors; with log file analysis, the server has to be configured to do this.</li>

<li>Page tagging is available to companies who do not have access to their web servers.</li>

<li>Lately, page tagging has become a standard in web analytics.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></li></ul>

<div class="mw-heading mw-heading4"><h4 id="Economic_factors">Economic factors</h4></div>

<p>Logfile analysis is almost always performed in-house. Page tagging can be performed in-house, but it is more often provided as a third-party service. The economic difference between these two models can also be a consideration for a company deciding which to purchase.

</p>

<ul><li>Logfile analysis typically involves a one-off software purchase; however, some vendors are introducing maximum annual page views with additional costs to process additional information. In addition to commercial offerings, several <a href="List_of_web_analytics_software#Free_/_Open_source_(FLOSS)" title="List of web analytics software">open-source logfile analysis tools</a> are available free of charge.</li>

<li>For Logfile analysis data must be stored and archived, which often grows large quickly. Although the cost of hardware to do this is minimal, the overhead for an IT department can be considerable.</li>

<li>For Logfile analysis software needs to be maintained, including updates and security patches.</li>

<li>Complex page tagging vendors charge a monthly fee based on volume i.e. number of page views per month collected.</li></ul>

<p>Which solution is cheaper to implement depends on the amount of technical expertise within the company, the vendor chosen, the amount of activity seen on the websites, the depth and type of information sought, and the number of distinct websites needing statistics.

</p><p>Regardless of the vendor solution or data collection method employed, the cost of web visitor analysis and interpretation should also be included. That is the cost of turning raw data into actionable information. This can be from the use of third-party consultants, the hiring of an experienced web analyst, or the training of a suitable in-house person. A <a href="Cost-benefit_analysis" class="mw-redirect" title="Cost-benefit analysis">cost-benefit analysis</a> can then be performed. For example, what revenue increase or cost savings can be gained by analyzing the web visitor data?

</p>

<div class="mw-heading mw-heading4"><h4 id="Hybrid_methods">Hybrid methods</h4></div>

<p>Some companies produce solutions that collect data through both log files and page tagging and can analyze both kinds. By using a hybrid method, they aim to produce more accurate statistics than either method on its own.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Geolocation_of_visitors">Geolocation of visitors</h3></div>

<p>With <a href="IP_geolocation" class="mw-redirect" title="IP geolocation">IP geolocation</a>, it is possible to track visitors' locations. Using an IP geolocation database or API, visitors can be geolocated to city, region, or country level.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup>

</p><p>IP Intelligence, or Internet Protocol (IP) Intelligence, is a technology that maps the Internet and categorizes IP addresses by parameters such as geographic location (country, region, state, city and postcode), connection type, Internet Service Provider (ISP), proxy information, and more. The first generation of IP Intelligence was referred to as <a href="Geotargeting" title="Geotargeting">geotargeting</a> or <a href="Geolocation" class="mw-redirect" title="Geolocation">geolocation</a> technology. This information is used by businesses for online audience segmentation in applications such as <a href="Online_advertising" title="Online advertising">online advertising</a>, <a href="Behavioural_targeting" class="mw-redirect" title="Behavioural targeting">behavioural targeting</a>, content localization (or <a href="Website_localization" title="Website localization">website localization</a>), <a href="Digital_rights_management" title="Digital rights management">digital rights management</a>, <a href="Personalization" title="Personalization">personalization</a>, online fraud detection, localized search, enhanced analytics, global traffic management, and content distribution.

</p>

<div class="mw-heading mw-heading3"><h3 id="Click_analytics">Click analytics</h3></div>

<p><a href="Click_analytics" title="Click analytics">Click analytics</a>, also known as <a href="Clickstream" class="mw-redirect" title="Clickstream">Clickstream</a> is a special type of web analytics that gives special attention to <a href="Point-and-click" class="mw-redirect" title="Point-and-click">clicks</a>.

</p><p>Commonly, <a href="Click_analytics" title="Click analytics">click analytics</a> focuses on on-site analytics. An editor of a website uses click analytics to determine the performance of his or her particular site, with regard to where the users of the site are clicking.

</p><p>Also, <a href="Click_analytics" title="Click analytics">click analytics</a> may happen in real-time or "unreal"-time, depending on the type of information sought. Typically, front-page editors on high-traffic news media sites will want to monitor their pages in real-time, to optimize the content. Editors, designers or other types of stakeholders may analyze clicks on a wider time frame to help them assess the performance of writers, design elements advertisements etc.

</p><p>Data about clicks may be gathered in at least two ways. Ideally, a click is "logged" when it occurs, and this method requires some functionality that picks up relevant information when the event occurs. Alternatively, one may institute the assumption that a page view is a result of a click, and therefore log a simulated click that led to that page view.

</p>

<div class="mw-heading mw-heading3"><h3 id="Customer_lifecycle_analytics">Customer lifecycle analytics</h3></div>

<div role="note" class="hatnote navigation-not-searchable">See also: <a href="Customer_lifecycle_management" title="Customer lifecycle management">Customer lifecycle management</a></div>

<p>Customer lifecycle analytics is a visitor-centric approach to measuring.<sup id="cite_ref-:0_16-0" class="reference"><a href="#cite_note-:0-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Page views, clicks and other events (such as API calls, access to third-party services, etc.) are all <a href="User_profiling" class="mw-redirect" title="User profiling">tied to an individual visitor</a> instead of being stored as separate data points. Customer lifecycle analytics attempts to connect all the data points into a <a href="Purchase_funnel" title="Purchase funnel">marketing funnel</a> that can offer insights into visitor behaviour and <a href="Search_engine_optimization" title="Search engine optimization">website optimization</a>.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> Common metrics used in customer lifecycle analytics include <a href="Customer_acquisition_cost" title="Customer acquisition cost">customer acquisition cost</a> (CAC), <a href="Customer_lifetime_value" title="Customer lifetime value">customer lifetime value</a> (CLV), customer <a href="Churn_rate" title="Churn rate">churn rate</a>, and <a href="Customer_satisfaction" title="Customer satisfaction">customer satisfaction</a> scores.<sup id="cite_ref-:0_16-1" class="reference"><a href="#cite_note-:0-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Other_methods">Other methods</h3></div>

<p>Other methods of data collection are sometimes used. Packet sniffing collects data by <a href="Packet_sniffer" class="mw-redirect" title="Packet sniffer">sniffing</a> the network traffic passing between the web server and the outside world. Packet sniffing involves no changes to the web pages or web servers. Integrating web analytics into the web server software is also possible.<sup id="cite_ref-integrated-analytics_18-0" class="reference"><a href="#cite_note-integrated-analytics-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Both these methods claim to provide better <a href="Real-time_business_intelligence" title="Real-time business intelligence">real-time</a> data than other methods.

</p>

<div class="mw-heading mw-heading2"><h2 id="Common_sources_of_confusion_in_web_analytics">Common sources of confusion in web analytics</h2></div>

<div class="mw-heading mw-heading3"><h3 id="The_hotel_problem">The hotel problem</h3></div>

<p>The hotel problem is generally the first problem encountered by a web analytics user. The problem is that the unique visitors for each day in a month do not add up to the same total as the unique visitors for that month. This appears to be a problem for inexperienced users in whatever analytics software they are using. It is a simple property of the metric definitions.

</p><p>The way to picture the situation is by imagining a hotel. The hotel has two rooms (Room A and Room B).

</p>

<th>Total

</th></tr>

<tr>

<th>Room A

</th>

<td>2 Unique Users

</td></tr>

<tr>

<th>Room B

</th>

<td>2 Unique Users

</td></tr>

<tr>

<th>Total

</th>

<td>?

</td></tr></tbody></table>

<p>As the table shows, the hotel has two unique users each day over three days. The sum of the totals concerning the days is therefore six.

</p><p>During the period each room has had two unique users. The sum of the totals concerning the rooms is therefore four.

</p><p>Only three visitors have been in the hotel over this period. The problem is that a person who stays in a room for two nights will get counted twice if they are counted once on each day, but are only counted once if the total for the period is looked at. Any software for web analytics will sum these correctly for the chosen period, thus leading to the problem when a user tries to compare the totals.

</p>

<div class="mw-heading mw-heading3"><h3 id="Analytics_Poisoning">Analytics Poisoning</h3></div>

<p>As the internet has matured, the proliferation of automated bot traffic has become an increasing problem for the reliability of web analytics. As bots traverse the internet, they render web documents in ways similar to organic users, and as a result may incidentally trigger the same code that web analytics use to count traffic. Jointly, this incidental triggering of web analytics events impacts the interpretability of data and inferences made upon that data. IPM provided a proof of concept of how <a href="Google_Analytics" title="Google Analytics">Google Analytics</a> as well as their competitors are easily triggered by common bot deployment strategies.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Problems_with_third-party_cookies">Problems with third-party cookies</h2></div>

<div role="note" class="hatnote navigation-not-searchable">See also: <a href="Web_tracking#Prevention" title="Web tracking">Web tracking § Prevention</a></div>

<p>Historically, vendors of page-tagging analytics solutions have used <a href="Third-party_cookie" class="mw-redirect" title="Third-party cookie">third-party cookies</a> sent from the vendor's domain instead of the domain of the website being browsed. Third-party cookies can handle visitors who cross multiple unrelated domains within the company's site since the cookie is always handled by the vendor's servers.

</p><p>However, third-party cookies in principle allow tracking an individual user across the sites of different companies, allowing the analytics vendor to collate the user's activity on sites where he provided personal information with his activity on other sites where he thought he was anonymous. Although web analytics companies deny doing this, other companies such as companies supplying <a href="Web_banner" title="Web banner">banner ads</a> have done so. <a href="Third-party_cookie" class="mw-redirect" title="Third-party cookie">Privacy concerns about cookies</a> have therefore led a noticeable minority of users to block or delete third-party cookies. In 2005, some reports showed that about 28% of Internet users blocked third-party cookies and 22% deleted them at least once a month.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup>

Most vendors of page tagging solutions have now moved to provide at least the option of using <a href="First-party_cookie" class="mw-redirect" title="First-party cookie">first-party cookies</a> (cookies assigned from the client subdomain).

</p><p>Another problem is cookie deletion. When web analytics depend on cookies to identify unique visitors, the statistics are dependent on a persistent cookie to hold a unique visitor ID. When users delete cookies, they usually delete both first- and third-party cookies. If this is done between interactions with the site, the user will appear as a first-time visitor at their next interaction point. Without a persistent and unique visitor ID, conversions, click-stream analysis, and other metrics dependent on the activities of a unique visitor over time cannot be accurate.

</p><p>Cookies are used because <a href="IP_address" title="IP address">IP addresses</a> are not always unique to users and may be shared by large groups or proxies. In some cases, the IP address is combined with the user agent to more accurately identify a visitor if cookies are not available. However, this only partially solves the problem because often users behind a proxy server have the same user agent. Other methods of uniquely identifying a user are technically challenging and would limit the trackable audience or would be considered suspicious. Cookies reach the lowest common denominator without using technologies regarded as <a href="Spyware" title="Spyware">spyware</a> and having cookies enabled/active leads to security concerns.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Secure_analytics_(metering)_methods">Secure analytics (metering) methods</h2></div>

<p>Third-party information gathering is subject to any network limitations and security applied. Countries, Service Providers and Private Networks can prevent site visit data from going to third parties.

All the methods described above (and some other methods not mentioned here, like sampling) have the central problem of being vulnerable to manipulation (both inflation and deflation). This means these methods are imprecise and insecure (in any reasonable model of security). This issue has been addressed in several papers,<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> but to date the solutions suggested in these papers remain theoretical.

</p>

<ul><li><a href="List_of_web_analytics_software" title="List of web analytics software">List of web analytics software</a></li>

<li><a href="Mobile_Web_Analytics" class="mw-redirect" title="Mobile Web Analytics">Mobile Web Analytics</a></li>

<li><a href="Online_video_analytics" title="Online video analytics">Online video analytics</a></li>

<li><a href="Post-click_marketing" title="Post-click marketing">Post-click marketing</a></li>

<li><a href="Session_(web_analytics)" title="Session (web analytics)">Session (web analytics)</a></li>

<li><a href="Web_log_analysis_software" title="Web log analysis software">Web log analysis software</a></li>

<li><a href="Web_mining" class="mw-redirect" title="Web mining">Web mining</a></li>

<li><a href="Web_performance" title="Web performance">Web performance</a></li>

<li><a href="Web_traffic" title="Web traffic">Web traffic</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">WAA Standards Committee. "Web analytics definitions." Washington DC: Web Analytics Association (2008).</span>

</li>

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<div class="mw-heading mw-heading2"><h2 id="Bibliography">Bibliography</h2></div>

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