n><span class="va">incidence</span><span class="op">)</span> <span class="op">~</span> <span class="va">period</span> <span class="op">+</span> <span class="op">(</span><span class="fl">1</span><span class="op">|</span><span class="va">herd</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>  family<span class="op">=</span><span class="va">binomial</span>, data<span class="op">=</span><span class="va">cbpp</span><span class="op">)</span><span class="op">)</span></span></span>
<span clas