!.

the poisson distribution is the distribution of the number of events
in the interval (0,alamba) when the waiting time between events is
exponentially distributed with mean = 1 and standard deviation = 1.

note that the percent point function of a distribution is identically
the same as the inverse cumulative distribution function of the
distribution.
</code></pre></div>

<h2 id="options">OPTIONS</h2>
<div class="codehilite"><pre><span></span><code> X   description of parameter
 Y   description of parame