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<title>Variance</title>
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<h1 class="refname">trader_var</h1>
<p class="verinfo">(PECL trader >= 0.2.0)</p><p class="refpurpose"><span class="refname">trader_var</span> — <span class="dc-title">Variance</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.trader-var-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>trader_var</strong></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter">$real</code></span>
[, <span class="methodparam"><span class="type">integer</span> <code class="parameter">$timePeriod</code></span>
[, <span class="methodparam"><span class="type">float</span> <code class="parameter">$nbDev</code></span>
]] )</div>
<p class="para rdfs-comment">
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.trader-var-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">real</code></em></span>
<dd>
<p class="para">
Array of real values.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">timePeriod</code></em></span>
<dd>
<p class="para">
Number of period. Valid range from 2 to 100000.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">nbDev</code></em></span>
<dd>
<p class="para">
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.trader-var-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">Returns an array with calculated data or false on failure.</p>
</div>
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