amma(\nu / 2)} \,
y^{\nu/2 - 1} \, \exp \! \left( -\, \frac{1}{2} \, y \right) . \end{equation*}\]</span></p>
</section>
<section id="sampling-statement-1" class="level3">
<h3 class="anchored" data-anchor-id="sampling-statement-1">Sampling statement</h3>
<p><code>y ~</code> <strong><code>chi_square</code></strong><code>(nu)</code></p>
<p>Increment target log probability density with <code>chi_square_lupdf(y | nu)</code>.</p>
<small><i>Available since 2.0</i></small>
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