 if every car observation were a manual versus if every car observation were an automatic. The output of <code><a href="../reference/margins.html">margins()</a></code> is a simplified summary of the estimated marginal effects across the requested variable levels/combinations specified in <code>at</code>:</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r">x &lt;-<span class="st"> </span><span class="kw">lm</span>(mpg <span class="op">~</span><span class="st"> </span>cyl <span cl