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<p><code>real</code> <strong><code>inv_gamma_lupdf</code></strong><code>(reals y | reals alpha, reals beta)</code><br> The log of the inverse gamma density of y given shape alpha and scale beta dropping constant additive terms</p>
<small><i>Available since 2.25</i></small>
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<p><code>real</code> <strong><code>inv_gamma_cdf</code></strong>