</span> <span class="st">"Placebo"</span><span class="op">)</span></span>
<span></span>
<span>    <span class="co">## Extract results</span></span>
<span>    <span class="va">marginal_results</span> <span class="op">&lt;-</span> <span class="va">marginal_fit</span><span class="op">$</span><span class="va">marginal_results</span></span>
<span>    <span class="va">diff_est</span> <span class="op">&lt;-</span> <span class="va">marginal_results</span><span class="op">[</span><span class="va">marginal_results</s