lass='fu'><a href='https://rdrr.io/r/stats/family.html'>Gamma</a></span><span class='op'>(</span>concentration<span class='op'>=</span><span class='fl'>1.</span>, <span class='va'>rate</span><span class='op'>)</span>
</pre>

<p>The Exponential distribution uses a <code>rate</code> parameter, or "inverse scale",
which can be intuited as,</p><pre><span class='va'>X</span> <span class='op'>~</span> <span class='fu'><a href='https://rdrr.io/r/stats/Exponential.html'>Exponential</a></span><span class='op'>(</spa