n class="st"> </span>wt <span class="op">*</span><span class="st"> </span>am, <span class="dt">data =</span> mtcars)
<span class="kw">summary</span>(<span class="kw"><a href="../reference/margins.html">margins</a></span>(x1))</code></pre></div>
<pre><code>##  factor     AME     SE       z      p   lower   upper
##      am -2.4729 3.0342 -0.8150 0.4151 -8.4198  3.4739
##    drat  0.8882 1.7047  0.5210 0.6023 -2.4529  4.2293
##      wt -5.8203 0.8769 -6.6373 0.0000 -7.5390 -4.1016</code></pre>
<p>By default, 