Graphics Reference
In-Depth Information
Figure 6-27. Dot plot with no y labels, max bin size of .25, and a rug showing each data point
You may notice that the stacks aren't regularly spaced in the horizontal direction. With the de-
fault dotdensity binning algorithm, the position of each stack is centered above the set of data
points that it represents. To use bins that are arranged with a fixed, regular spacing, like a his-
togram, use method="histodot" . In Figure 6-28 , you'll notice that the stacks aren'tcentered
above the data:
p + geom_dotplot(method = "histodot" , binwidth = .25 ) + geom_rug() +
scale_y_continuous(breaks = NULL
NULL ) + theme(axis.title.y = element_blank())
Figure 6-28. Dot plot with histodot (fixed-width) binning
The dots can also be stacked centered, or centered in such a way that stacks with even and
odd quantities stay aligned. This can by done by setting stackdir="center" or stack-
dir="centerwhole" , as illustrated in Figure 6-29 :
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