GoogleServices/Sources/doku/10_gaTrackingVisitors.html

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2011-02-27 00:25:02 +01:00
<!DOCTYPE HTML>
<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Visitor Configuration - Google Analytics - Google Code</title>
<script type="text/javascript"><!--
(function(){function a(){this.t={};this.tick=function(c){this.t[c]=(new Date).getTime()};this.tick("start")}var b=new a;window.jstiming={Timer:a,load:b};if(window.external&&window.external.pageT)window.jstiming.pt=window.external.pageT;})();
var _tocPath_ = '/html/apis/analytics/_toc.ezt';
var codesite_token = '56328469b0a0a7c65c4a395ddd8cde4c';
var logged_in_user_email = 'dan1978@gmx.net';
//--></script>
<link href="10_gaTrackingVisitors-Dateien/codesite.css" type="text/css" rel="stylesheet">
<script src="10_gaTrackingVisitors-Dateien/codesite_head.js" type="text/javascript"></script>
<script type="text/javascript">CODESITE_CSITimer['load'].tick('bhs');</script>
<link rel="search" type="application/opensearchdescription+xml" title="Google Code" href="http://code.google.com/osd.xml">
<!--[if IE]><link rel="stylesheet" type="text/css" href="/css/iehacks.css"><![endif]-->
<link href="10_gaTrackingVisitors-Dateien/semantic_headers.css" rel="stylesheet" type="text/css">
<link href="10_gaTrackingVisitors-Dateien/local_extensions.css" rel="stylesheet" type="text/css">
<script src="10_gaTrackingVisitors-Dateien/ga.js" async="" type="text/javascript"></script></head><body class="gc-documentation">
<div id="gb">
<span>
<b>dan1978@gmx.net</b>
|
<a href="http://code.google.com/u/dan1978@gmx.net/" id="projects-dropdown" onclick="return false;"><span style="text-decoration: underline;">My favorites</span> <span style="font-size: 0.75em;"></span></a>
|
<a id="lang-dropdown" href="http://code.google.com/" onclick="return false;"><span style="text-decoration: underline;">English</span> <span style="font-size: 0.75em;"></span></a>
| <a href="http://www.google.com/accounts/Logout?continue=http%3A%2F%2Fcode.google.com%2Fintl%2Fde%2Fapis%2Fanalytics%2Fdocs%2Ftracking%2FgaTrackingVisitors.html" onclick="CODESITE_click('/gb/sc/signout');"><span style="text-decoration: underline;">Sign out</span></a>
</span>
</div>
<div class="gbh" style="left: 0px;"></div>
<div class="gbh" style="right: 0px;"></div>
<div id="gc-container">
<a id="top"></a>
<div id="skipto">
<a href="#gc-pagecontent">Skip to page content</a>
<a href="#gc-toc">Skip to main navigation</a>
</div>
<div id="gc-header">
<div id="logo"><a href="http://code.google.com/">
<img src="10_gaTrackingVisitors-Dateien/code_logo.gif" alt="Google Code" style="border: 0pt none; margin: 3px 0pt 0pt;" height="40" width="167">
</a></div>
<div id="search">
<div id="searchForm">
<form id="cse" action="http://www.google.com/cse" accept-charset="utf-8" onsubmit="executeGSearch(document.getElementById('gsearchInput').value); return false;">
<noscript>
<input type="hidden" name="cref" value="http://code.google.com/cse/googlecode-context.xml">
</noscript>
<div id="gsc-search-box">
<input id="gsearchInput" name="q" maxlength="2048" class="gsc-input" autocomplete="off" title="Google Code Search" style="width: 345px;" type="text">
<div id="cs-searchresults" onclick="event.cancelBubble = true;"></div>
<input title="Search" id="gsearchButton" class="gsc-search-button" name="sa" value="Search" type="submit">
<div class="greytext">e.g. "adwords" or "open source"</div>
</div>
</form>
</div> <!-- end searchForm -->
</div> <!-- end search -->
</div> <!-- end gc-header -->
<div id="codesiteContent">
<a id="gc-topnav-anchor"></a>
<div id="gc-topnav"><img id="gc-star" src="10_gaTrackingVisitors-Dateien/star_off.gif" height="15" width="15">
<h1 class="mozilla">Google Analytics</h1>
<ul id="docs" class="gc-topnav-tabs">
<li id="home_link">
<a href="http://code.google.com/apis/analytics/" title="Google Analytics home page">Home</a>
</li>
<li id="docs_link">
<a href="http://code.google.com/apis/analytics/docs/index.html" class="selected" title="Official Google Analytics documentation">Docs</a>
</li>
<li id="faq_link">
<a href="http://code.google.com/apis/analytics/docs/gdata/gdataFAQ.html" title="Answers to frequently asked questions about Google Analytics">FAQ</a>
</li>
<li id="articles_link">
<a href="http://code.google.com/apis/analytics/docs/gdata/gdataArticlesCode.html" title="Focused articles and tutorials for Google Analytics developers">Articles</a>
</li>
<li>
<a href="http://analytics.blogspot.com/" title="Official Google Analytics blog">Blog</a>
</li>
<li>
<a href="http://code.google.com/apis/analytics/groups/groups.html" title="Google Analytics developer forum">Forum</a>
</li>
<li>
<a href="http://www.google.com/analytics/tos.html" title="Google Analytics terms of service">Terms</a>
</li>
</ul>
</div> <!-- end gc-topnav -->
<div class="g-section g-tpl-210">
<div class="g-unit g-first" id="gc-toc">
<link href="10_gaTrackingVisitors-Dateien/local_extensions.css" rel="stylesheet" type="text/css">
<ul class="treelist tlw-nested-only tlw-processed tlw-instance-0">
<li>
<ul>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Overview"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Overview" class="tlw-control tlw-plus"></a><span class="tlw-title"><strong>Overview</strong></span></div><ul style="display: none;" id="0-sub-0">
<li><a href="http://code.google.com/apis/analytics/docs/concepts/gaConceptsOverview.html">Functional Overview</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/concepts/gaConceptsAccounts.html">Accounts &amp; Profiles</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/concepts/gaConceptsCookies.html">Cookies</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/concepts/gaConceptsDomains.html">Domains &amp; Directories</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/concepts/gaConceptsSampling.html">Sampling</a></li>
</ul>
</li>
</ul>
</li>
</ul>
<div class="dottedLine"></div>
<div class="sectionTitle"><span class="sectionFont">Tracking Code</span></div>
<ul class="treelist tlw-nested-only tlw-processed tlw-instance-1" style="margin-top: -15px;">
<li>
<ul>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/home.html">Home</a></li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Collapse Getting Started"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Collapse Getting Started" class="tlw-control tlw-minus"></a><a href="http://code.google.com/apis/analytics/docs/tracking/asyncTracking.html">Getting Started</a></div><ul style="display: block;" id="1-sub-0">
<li><a href="http://code.google.com/apis/analytics/docs/tracking/asyncUsageGuide.html">Async Usage</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/asyncMigrationExamples.html">Async Migration</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingEcommerce.html">Ecommerce Tracking</a></li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Event Tracking"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Event Tracking" class="tlw-control tlw-plus"></a><a href="http://code.google.com/apis/analytics/docs/tracking/eventTrackerOverview.html">Event Tracking</a></div><ul style="display: none;" id="1-sub-1">
<li><a href="http://code.google.com/apis/analytics/docs/tracking/eventTrackerGuide.html">Implementing</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/eventTrackerWrappers.html">Extending</a></li>
</ul>
</li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingSite.html">Cross-Domain Tracking</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingTraffic.html">Traffic Sources</a></li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch selected"><a href="javascript:void(0)" class="tlw-control" title="Collapse Visitor Configuration"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Collapse Visitor Configuration" class="tlw-control tlw-minus"></a><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingVisitors.html">Visitor Configuration</a></div><ul style="display: block;" id="1-sub-2">
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingCustomVariables.html">Custom Variables</a></li>
<li class="deprecated"><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingVisitorSegments.html">Custom Visitor Segments</a></li>
</ul>
</li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingOverview.html">Traditional Snippet</a></li>
</ul>
</li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Tracking Reference"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Tracking Reference" class="tlw-control tlw-plus"></a><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApi.html">Tracking Reference</a></div><ul style="display: none;" id="1-sub-3">
<li>Global Objects
<ul>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApi_gat.html">_gat</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApi_gaq.html">_gaq</a></li>
</ul>
</li><li>Tracker Objects
<ul class="treelist tlw-processed tlw-instance-2">
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiBasicConfiguration.html">Basic Configuration</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiCampaignTracking.html">Campaign Tracking</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiDomainDirectory.html">Domains &amp; Directories</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiEcommerce.html">Ecommerce</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiEventTracking.html">Event Tracking</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiSearchEngines.html">Search Engines and Referrers</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiWebClient.html">Web Client</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiUrchin.html">Urchin Server</a></li>
</ul>
</li>
</ul>
</li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Libraries"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Libraries" class="tlw-control tlw-plus"></a><span class="tlw-title">Libraries</span></div><ul style="display: none;" id="1-sub-4">
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gadgetTracking.html">Gadgets</a></li>
<li><a href="http://code.google.com/chrome/extensions/trunk/tut_analytics.html">Chrome Extensions</a></li>
<li><a style="text-decoration: none;" href="http://code.google.com/mobile/analytics/docs/"><span style="text-decoration: underline;">Mobile</span><span class="new">&nbsp;&nbsp;Updated</span></a> (Labs <img src="10_gaTrackingVisitors-Dateien/labs-11.png" alt="in Labs" style="padding: 0pt; margin: 0pt;">)</li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Flash/Flex (Labs )"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Flash/Flex (Labs )" class="tlw-control tlw-plus"></a><span class="tlw-title"><a href="http://code.google.com/apis/analytics/docs/tracking/flashTrackingIntro.html">Flash/Flex</a> (Labs <img src="10_gaTrackingVisitors-Dateien/labs-11.png" alt="in Labs" style="padding: 0pt; margin: 0pt;">)</span></div><ul style="display: none;" id="1-sub-5">
<li><a href="http://code.google.com/apis/analytics/docs/tracking/flashTrackingSetupFlash.html">Flash Setup</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/flashTrackingSetupFlex.html">Flex Setup</a></li>
</ul>
</li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/silverlightTrackingIntro.html">Silverlight</a> (Labs <img src="10_gaTrackingVisitors-Dateien/labs-11.png" alt="in Labs" style="padding: 0pt; margin: 0pt;">)</li>
</ul>
</li>
<li>
<a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingTroubleshooting.html">Troubleshooting</a>
</li>
<li><a href="http://code.google.com/apis/analytics/docs/gaJS/changelog.html">Changelog - ga.js</a></li>
</ul>
</li>
</ul>
<div class="dottedLine"></div>
<div class="sectionTitle"><span class="sectionFont">Management API <span style="letter-spacing: normal;">(Labs <img src="10_gaTrackingVisitors-Dateien/labs-11.png" alt="in Labs" style="padding: 0pt; margin: 0pt;">)</span></span></div>
<ul class="treelist tlw-nested-only tlw-processed tlw-instance-3" style="margin-top: -15px;">
<li>
<ul class="treelist tlw-processed tlw-instance-4">
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/home.html">Home</a>
</li><li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Getting Started"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Getting Started" class="tlw-control tlw-plus"></a><a href="http://code.google.com/apis/analytics/docs/mgmt/mgmtDeveloperGuide.html">Getting Started</a></div><ul style="display: none;" id="3-sub-0">
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/mgmtAuthentication.html">Authorization</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/mgmtProtocol.html">Protocol</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/mgmtJava.html">Java</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/mgmtJavascript.html">Javascript</a></li>
</ul>
</li>
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/mgmtFeedReference.html">Feed Reference</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/mgmtLibraries.html">Libraries &amp; Examples</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/mgmt/changelog.html">Changelog</a></li>
</ul>
</li>
</ul>
<div class="dottedLine"></div>
<div class="sectionTitle"><span class="sectionFont">Export API <span style="letter-spacing: normal;">(Labs <img src="10_gaTrackingVisitors-Dateien/labs-11.png" alt="in Labs" style="padding: 0pt; margin: 0pt;">)</span></span></div>
<ul class="treelist tlw-nested-only tlw-processed tlw-instance-5" style="margin-top: -15px;">
<li>
<ul>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/home.html">Home</a></li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Getting Started"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Getting Started" class="tlw-control tlw-plus"></a><a href="http://code.google.com/apis/analytics/docs/gdata/gdataDeveloperGuide.html">Getting Started</a></div><ul style="display: none;" id="5-sub-0">
<li><a href="http://code.google.com/apis/analytics/docs/gdata/gdataAuthentication.html">Authorization</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/2.0/gdataProtocol.html">Protocol</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/2.0/gdataJava.html">Java</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/2.0/gdataJavascript.html">Javascript</a></li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Version 1.0"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Version 1.0" class="tlw-control tlw-plus"></a><span class="tlw-title">Version 1.0</span></div><ul style="display: none;" id="5-sub-1">
<li><a href="http://code.google.com/apis/analytics/docs/gdata/1.0/gdataProtocol.html">Protocol</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/1.0/gdataJava.html">Java</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/1.0/gdataJavascript.html">Javascript</a></li>
</ul></li>
</ul>
</li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Feed Reference"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Feed Reference" class="tlw-control tlw-plus"></a><a href="http://code.google.com/apis/analytics/docs/gdata/gdataReference.html">Feed Reference</a></div><ul style="display: none;" id="5-sub-2">
<li><a href="http://code.google.com/apis/analytics/docs/gdata/gdataReferenceAccountFeed.html">Account Feed</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/gdataReferenceDataFeed.html">Data Feed</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/gdataCommonQueries.html">Common Queries</a>
</li><li><a href="http://code.google.com/apis/analytics/docs/gdata/gdataExplorer.html">Query Explorer</a></li>
</ul></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/gdataReferenceDimensionsMetrics.html">Dimensions &amp; Metrics</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gdata/gdataLibraries.html">Libraries &amp; Examples</a></li>
<li style="padding-top: 0pt; padding-bottom: 0pt;">
<div class="tlw-title tlw-branch"><a href="javascript:void(0)" class="tlw-control" title="Expand Changelog &amp; Issues"><img src="10_gaTrackingVisitors-Dateien/cleardot.gif" alt="Expand Changelog &amp; Issues" class="tlw-control tlw-plus"></a><span class="tlw-title">Changelog &amp; Issues</span></div><ul style="display: none;" id="5-sub-3">
<li><a href="http://code.google.com/apis/analytics/docs/gdata/changelog.html">Changelog</a></li>
<li><a href="http://code.google.com/p/gdata-issues/issues/list?can=2&amp;q=label:API-Analytics&amp;colspec=API+ID+Type+Status+Priority+Stars+Summary&amp;cells=tiles">Issue Tracker</a></li>
</ul>
</li>
</ul>
</li>
</ul>
<div class="dottedLine"></div>
<div class="sectionTitle"><span class="sectionFont">Website Optimizer <span style="letter-spacing: normal;">(Labs <img src="10_gaTrackingVisitors-Dateien/labs-11.png" alt="in Labs" style="padding: 0pt; margin: 0pt;">)</span></span></div>
<ul class="treelist tlw-nested-only tlw-processed tlw-instance-6" style="margin-top: -15px;">
<li>
<ul>
<li><a href="http://code.google.com/apis/analytics/docs/gwo/index.html">Getting Started</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gwo/commonTasks.html">Common Tasks</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gwo/feedReference.html">Feed Reference</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/gwo/gwoFAQ.html">FAQ</a></li>
</ul>
</li>
</ul>
<a class="hidden" href="#gc-topnav-anchor">More Google Analytics resource links</a>
</div>
<div style="position: relative;" class="g-unit" id="gc-pagecontent">
<script type="text/javascript">CODESITE_docEarlyProcessing();</script>
<h1 class="page_title">Visitor Configuration</h1>
<p>The documents in this section cover the following topics related to customizations for your website visitors.
</p><ul>
<li><a href="#userSession">Adjusting the User Session</a></li>
<li><a href="#browserFeatures">Configuring Browser Capabilities Detection</a></li>
<li><a href="#visitorSampling">Turning on Visitor Sampling</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingCustomVariables.html">Custom Variables</a></li>
<li><a href="http://code.google.com/apis/analytics/docs/tracking/gaTrackingVisitorSegments.html">Custom Visitor Segments</a></li>
</ul>
<h2 id="userSession">Adjusting the User Session</h2>
<p>A user session is defined as the period of visitor inactivity allowed
before the session ends. When a user visits a page on your site, a
session is established. Session length is determined as follows in these
situations:</p>
<ul>
<li>The user ceases activity on the page for 30 minutes, and additional activity is attributed to a new session. </li>
<li>The user exits the page and returns <em>within</em> 30 minutes, and the return visit is counted as part of the original session. </li>
<li>A user remains actively engaged on the site for 2 hours, and all activity is counted as part of the same session. </li>
</ul>
<p>User session length is relevant to how unique page views are counted.
The unique page view count for a page represents the number of user
sessions in which that page was viewed one or more times. For example,
if a user visits your site in a single session and views the same page
10 times, then the page view count for that page will increase by 10.
However, the unique page view count for that page will only be 1. If
you decrease or increase the length of the user session, you will impact
session timeout tolerance for your site and likely generate fewer or
more unique page views.</p>
<p>To define user session length, use the<a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiBasicConfiguration.html#_gat.GA_Tracker_._setSessionCookieTimeout"><code> _setSessionCookieTimeout()</code></a> method.</p>
<h2 id="browserFeatures">Configuring Browser Capabilities Detection</h2>
<p>Google Analytics automatically tracks a number of statistics about the browser capabilities of visitors to your site:</p>
<ul>
<li>Browser type</li>
<li>Operating system</li>
<li>Browser-operating system combined metric</li>
<li>Screen Colors</li>
<li>Screen Resolution</li>
<li>Flash Versions</li>
<li>Java Support</li>
</ul>
<p>You can use a number of methods to enable or disable client
detection, including Flash, general browser capabilities, or Flash
player capabilities. You can also verify whether this detection is
enabled for your site. See the <a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiWebClient.html">GATC Web Client</a> method reference for details.</p>
<h2 id="visitorSampling">Turning on Visitor Sampling</h2>
<p>If your website has a very large volume of traffic into the millions
of page views per month, you can turn on visitor sampling to reduce load
on all systems involved. In Google Analytics, data sampling is done
intelligently, so that you are still able to track the same user
behavior and trending activity that you would without sampling. This is
because sampling occurs over unique visitors. So, if Visitor A is
sampled and Visitor B is not, then sampling will always include Visitor A
and not Visitor B. Data sampling with Google Analytics is set with a
percentage. Use the <a href="http://code.google.com/apis/analytics/docs/gaJS/gaJSApiBasicConfiguration.html#_gat.GA_Tracker_._setSampleRate"><code>_setSampleRate()</code></a> method to enable sampling at the desired percentage.</p>
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