he Grammar of Graphics (Statistics and Computing)</em>. Secaucus, NJ, USA: Springer-Verlag New York, Inc.</p>
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<div class="footnotes">
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<li id="fn2"><p>If you aren’t already familiar with the grammar of graphics or <strong>ggplot2</strong>, we recommend reading the Data Visualization chapter from the <em>R for Data Science</em> book. <a href="https://r4ds.had.co.nz/data-visualisation.html" class="uri">https://r4ds.had.co.nz/data-visualisation.html</a><a href="overview.htm