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<title>Calculates any one parameter of the non-central chi-square distribution given values for the others</title>
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<h1 class="refname">stats_cdf_noncentral_chisquare</h1>
<p class="verinfo">(PECL stats >= 1.0.0)</p><p class="refpurpose"><span class="refname">stats_cdf_noncentral_chisquare</span> — <span class="dc-title">Calculates any one parameter of the non-central chi-square distribution given values for the others</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.stats-cdf-noncentral-chisquare-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">float</span> <span class="methodname"><strong>stats_cdf_noncentral_chisquare</strong></span>
( <span class="methodparam"><span class="type">float</span> <code class="parameter">$par1</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$par2</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$par3</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$which</code></span>
)</div>
<p class="para rdfs-comment">
Returns the cumulative distribution function, its inverse, or one of its parameters,
of the non-central chi-square distribution. The kind of the return value and parameters
(<code class="parameter">par1</code>, <code class="parameter">par2</code>, and <code class="parameter">par3</code>)
are determined by <code class="parameter">which</code>.
</p>
<p class="para">
The following table lists the return value and parameters by <code class="parameter">which</code>.
CDF, x, k, and lambda denotes cumurative distribution function, the value of the random
variable, the degree of freedom and the non-centrality parameter of the distribution,
respectively.
<table class="doctable table">
<caption><strong>Return value and parameters</strong></caption>
<thead>
<tr>
<th><code class="parameter">which</code></th>
<th>Return value</th>
<th><code class="parameter">par1</code></th>
<th><code class="parameter">par2</code></th>
<th><code class="parameter">par3</code></th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>1</td>
<td>CDF</td>
<td>x</td>
<td>k</td>
<td>lambda</td>
</tr>
<tr>
<td>2</td>
<td>x</td>
<td>CDF</td>
<td>k</td>
<td>lambda</td>
</tr>
<tr>
<td>3</td>
<td>k</td>
<td>x</td>
<td>CDF</td>
<td>lambda</td>
</tr>
<tr>
<td>4</td>
<td>lambda</td>
<td>x</td>
<td>CDF</td>
<td>k</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.stats-cdf-noncentral-chisquare-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">par1</code></dt>
<dd>
<p class="para">
The first parameter
</p>
</dd>
<dt>
<code class="parameter">par2</code></dt>
<dd>
<p class="para">
The second parameter
</p>
</dd>
<dt>
<code class="parameter">par3</code></dt>
<dd>
<p class="para">
The third parameter
</p>
</dd>
<dt>
<code class="parameter">which</code></dt>
<dd>
<p class="para">
The flag to determine what to be calculated
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.stats-cdf-noncentral-chisquare-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns CDF, x, k, or lambda, determined by <code class="parameter">which</code>.
</p>
</div>
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