ement</h3>
<p><code>y ~</code> <strong><code>scaled_inv_chi_square</code></strong><code>(nu, sigma)</code></p>
<p>Increment target log probability density with <code>scaled_inv_chi_square_lpdf( y | nu, sigma)</code>
dropping constant additive terms.
</p>
</div>
<div id="stan-functions-31" class="section level3">
<h3><span class="header-section-number">16.4.3</span> Stan Functions</h3>
<!-- real; scaled_inv_chi_square_lpdf; (reals y | reals nu, reals sigma); -->
<p></p>
<p><code>real</code> <strong><code>sca