[R] ggplot: dodge positions

[Rui Barradas]

Hello,

Though I'm not the most fluent user of ggplot, I've seen no problem with 
the graph, each subgroup of points is over each boxplot.

Maybe what made the difference was the use of --->  ggplot2
not ggplot.

Hope this helps,

Rui Barradas

Em 02-07-2012 10:43, Thaler,Thorn,LAUSANNE,Applied Mathematics escreveu:
> Dear all,
>
> I want to get a series of boxplots (grouped by two factors) and I want to overlay the original observations and the following code does almost what I want:
>
> library(ggplot)
> ddf <- data.frame(x=factor(rep(LETTERS[1:4], each=30)), y = runif(120,0,10), grp = factor(rep(rep(1:3, 10), 4)))
> ggplot(ddf, aes(x, y, colour=grp)) + geom_boxplot() + geom_point()
>
> Yet the position of the points and the position of the boxes on the x-axis is not the same. I would like that the points are shifted accordingly, such that they line up with the boxplots. I tried position_dodge:
>
> ggplot(ddf, aes(x, y, colour=grp)) + geom_boxplot() + geom_point(aes(ymax=max(y)), position = position_dodge(width=.75))
>
> but that did not really help, as all points are now dodged and I just want to have a fixed offset for each subgroup of points such that the boxplot and the points are aligned. Any ideas?
>
>
> Kind Regards,
>
> Thorn Thaler
> Mathematician
>
> Applied Mathematics
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