href="https://rdrr.io/r/base/factor.html" class="external-link">factor</a></span><span class="op">(</span><span class="cn">NA</span><span class="op">)</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>                 start<span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span>theta<span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/Log.html" class="external-link">log</a></