tion that is going to be accessed as distributions must return the log of the density or mass function it defines.</p>
</section>
</section>
<section id="parameters-are-constant" class="level2">
<h2 class="anchored" data-anchor-id="parameters-are-constant">Parameters are constant</h2>
<p>Within function definition bodies, the parameters may be used like any other variable. But the parameters are constant in the sense that they can’t be assigned to (i.e., can’t appear on the left side of an assignment (<