Brooks/Cole, a division of Thomson Learning.</p>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/graphics/boxplot.html" class="external-link">boxplot</a></span><span class="op">(</span><span class="va">gpa</span> <span class="op">~</span> <span class="va">gender</span>, data <span class="op">=</span> <span class="va">Simpson</s