<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Returns the variance</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.stats-stat-powersum.html">stats_stat_powersum</a></div> <div class="next" style="text-align: right; float: right;"><a href="book.trader.html">Trader</a></div> <div class="up"><a href="ref.stats.html">Statistic Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.stats-variance" class="refentry"> <div class="refnamediv"> <h1 class="refname">stats_variance</h1> <p class="verinfo">(PECL stats >= 1.0.0)</p><p class="refpurpose"><span class="refname">stats_variance</span> — <span class="dc-title">Returns the variance</span></p> </div> <div class="refsect1 description" id="refsect1-function.stats-variance-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">float</span> <span class="methodname"><strong>stats_variance</strong></span> ( <span class="methodparam"><span class="type">array</span> <code class="parameter">$a</code></span> [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$sample</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span> ] )</div> <p class="para rdfs-comment"> Returns the variance of the values in <code class="parameter">a</code>. </p> </div> <div class="refsect1 parameters" id="refsect1-function.stats-variance-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <code class="parameter">a</code></dt> <dd> <p class="para"> The array of data to find the standard deviation for. Note that all values of the array will be cast to <span class="type"><a href="language.types.float.html" class="type float">float</a></span>. </p> </dd> <dt> <code class="parameter">sample</code></dt> <dd> <p class="para"> Indicates if <code class="parameter">a</code> represents a sample of the population; defaults to <strong><code>FALSE</code></strong>. </p> </dd> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.stats-variance-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the variance on success; <strong><code>FALSE</code></strong> on failure. </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.stats-stat-powersum.html">stats_stat_powersum</a></div> <div class="next" style="text-align: right; float: right;"><a href="book.trader.html">Trader</a></div> <div class="up"><a href="ref.stats.html">Statistic Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>