h requires some ggplot2 functions we haven't come across yet. Rather than using the raw data in <code>dat_factorial</code>, we use the means that we produced in <code>sum_dat_factorial</code>. This type of plot requires two geoms, one to draw the points, and one to draw the lines that connect them.</p>
<p>This plot reproduces the plot used in the paper.</p>
<ul>
<li>Run the code and then play around with how it looks by changing the arguments for e.g., colour, line-type, and the theme.</li>
</ul>
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