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POHow to enforce ggplot's position_dodge on categories with no data?
 

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  1. POHow to enforce ggplot's position_dodge on categories with no data?
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    <p>I'm trying to use position_dodge on ggplot to obtain boxplots of two different signals (ind) sharing the same categories (cat). When there is a category with data for one signal but not for the other one, the boxplot for the signal with data covers all the horizontal spacing, and does not respect the position_dodge instruction for that particular category. Is there a way to make ggplot to enforce the dodging rule? As you can see on the example below, the signal x has no data for category B, so it loses the space reserved by position_dodge. I would like to avoid that.</p> <p>Thanks in advance.</p> <pre><code>data&lt;-data.frame(cat=c('A','A','A','A','B','B','A','A','A','A','B','B'), values=c(3,2,1,4,NA,NA,4,5,6,7,8,9), ind=c('x','x','x','x','x','x','y','y','y','y','y','y')) print(ggplot() + scale_colour_hue(guide='none') + geom_boxplot( aes(x=as.factor(cat), y=values, fill=ind), position=position_dodge(width=.60), data=data, outlier.size = 1.2, na.rm=T)) </code></pre> <p><img src="https://i.stack.imgur.com/rKbeq.png" alt="graph with original problem"></p> <h1>PROGRESS UPDATE</h1> <p>After some workarounds, I came up with the outcome I was looking for... (kind of) </p> <pre><code>data &lt;- data.frame( cat=c('A','A','A','A','B','B','A','A','A','A','B','B','B'), values=c(3,2,1,4,NA,NA,4,5,6,7,8,9, 0), ind=c('x','x','x','x','x','x','y','y','y','y','y','y','x')) p &lt;- ggplot() + scale_colour_hue(guide='none') + geom_boxplot(aes(x=as.factor(cat), y=values, fill=ind), position=position_dodge(width=.60), data=data, outlier.size = 1.2, na.rm=T) + geom_line(aes(x=x, y=y), data=data.frame(x=c(0,3),y=rep(0,2)), size = 1, col='white') print(p) </code></pre> <p><img src="https://i.stack.imgur.com/G66bR.png" alt="solution with workaround"></p> <p>Some people remcomended using faceting for the effect I wanted. Faceting doesn't give me the effect I'm looking for. The final graph I was looking for is shown below:</p> <p><img src="https://i.stack.imgur.com/HHTZ8.png" alt="final graph"></p> <p>If you notice, the white major tick mark at y = 10 is thicker than the other tick marks. This thicker line is the geom_line with size=1 that hides unwanted boxplots.</p> <p>I wish we could combine different geom objects more seamlessly. I reported this as a bug on Hadley's github, but Hadley said this is how position_dodge behaves by design. I guess I'm using ggplot2 in a non-standard way and workarounds are the way to go on these kind of issues. Anyways, I hope this helps some of the R folks to push ggplot great functionality a little further.</p>
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