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POR ggplot - Coordinates transform (square root) with boxplot
 

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  1. POR ggplot - Coordinates transform (square root) with boxplot
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    <p>I have a couple of box and whisker plots in R. In both, the x-axis corresponds to one categorical variable whilst the grouping colours correspond to the other.</p> <p>If I draw both plots with an untransformed y-axis, they are both fine. However, if I try to square-root transform the y-axis (using: coord_trans(y = "sqrt")), one of those graph is still fine whilst the other drops the lines corresponding to the median in most boxes (except those for which there are only two groups and where the boxes are therefore slightly wider, see "Numbers" 1 and 2 on the first plot). Further, for the graph that does not draw properly, if I reduce the number of categories on my x-axis (hence getting the boxes wider again), the median lines appear again.</p> <p>Is this a bug with coord_trans (if so, how can I get around it) or a problem with my code?</p> <p>Thank you very much for any suggestion.</p> <pre><code>library(car) library(gplots) library(plyr) library(ggplot2) library(gridExtra) library(gdata) Category=factor(c(rep(1, times =3240), rep(2, times =2160)), labels=c("A","B"), levels=c(1,2)) ID=factor(rep(seq(from = 1, to = 45),each = 120)) Months=factor(rep(seq(from = 1, to = 3), each = 40, times = 45), labels=c("Jan","Feb","Mar"),levels=c(1:3)) Obs=rnorm(5400, mean=25, sd=15) Data=data.frame(Category,ID,Months,Obs) Data=subset(Data, (Data$Category=="B") | !(Data$ID%in%c(1,2)) | (Data$Months%in%c("Jan","Feb"))) for (j in 1:2) { sel=which(Data$Category==unique(levels(Data$Category))[j]) Observ=Data$Obs[sel] Month=Data$Months[sel] Number=droplevels(Data$ID[sel]) Number=droplevels(Number) Data_used=data.frame(Number,Month,Observ) plot1 = ggplot(Data_used, aes(Number, Observ)) + geom_boxplot(aes(fill=Month, drop=FALSE), na.rm=TRUE) + scale_y_continuous(breaks = c(0,20,40,60,80,100), limits=c(0,115)) + coord_trans(y = "sqrt") plot(plot1) } </code></pre>
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      1. POR ggplot - Coordinates transform (square root) with boxplot
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    1. COvery hard to help you without data or at least a picture where you show the problem.
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      1. USagstudy
    2. COSorry. Data added
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      1. USStéphane
    3. COReplace `scale_y_continuous()` with `scale_y_sqrt()` and lose the `coord_trans()` line. That seems to work for me (R-2.15.3, Win7 64-bit, ggplot2-0.9.3.1).
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      1. USDennis
 

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