class="op">~</span> <span class="va">x</span> <span class="op">+</span> <span class="fu"><a href="https://rdrr.io/r/base/AsIs.html" class="external-link">I</a></span><span class="op">(</span><span class="va">x</span><span class="op">^</span><span class="fl">2</span><span class="op">)</span>, family <span class="op">=</span> <span class="va">poisson</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/summary.html" class="external-link">summa