line level of exposure variable (<code>basecov</code>) nor the value of conditioning covariates of <code>W</code> and <code>Z</code> (<code>fixcov</code>), baseline exposure level is set to <code>0</code> as default. Since <code>W</code> and <code>Z</code> are both factor, they are fixed to their first level which are <code>0</code> and <code>female</code>.</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb2-1" data-line-number="1">simresul