-<span class="st"> </span>prediction<span class="op">::</span><span class="kw"><a href="http://www.rdocumentation.org/packages/prediction/topics/seq_range">seq_range</a></span>(mtcars<span class="op">$</span>wt, <span class="dv">10</span>)
m1 &lt;-<span class="st"> </span><span class="kw"><a href="../reference/margins.html">margins</a></span>(x1, <span class="dt">at =</span> <span class="kw">list</span>(<span class="dt">wt =</span> wts, <span class="dt">drat =</span> <span class="kw">range</span>(mtcars<spa