 this model and compare it to the output of the glm()-function from the stats package:</p>
<div class="sourceCode" id="cb2"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span class="co"># Usage of main function: countreg(y ~ z, data = d, family = "poisson")</span>
<span class="va">m0</span> <span class="op">&lt;-</span> <span class="fu"><a href="../reference/countreg.html">countreg</a></span><span class="op">(</span><span class="va">dv</span> <span class="op">~</span> <span class="va">z11<