scription of argument and return types, see section <a href="../functions-reference/conventions_for_probability_functions.html#prng-vectorization">vectorized PRNG functions</a>.</p>
<small><i>Available since 2.18</i></small>
</section>
</section>
<section id="beta-proportion-distribution" class="level2">
<h2 class="anchored" data-anchor-id="beta-proportion-distribution">Beta proportion distribution</h2>
<section id="probability-density-function-1" class="level3">
<h3 class="anchored" data-anchor-id="probabi