ggplot: dodge positions

-----Original Message-----
From: Rui Barradas [mailto:ruipbarradas at sapo.pt]
Sent: Montag, 2. Juli 2012 12:20
To: Thaler,Thorn,LAUSANNE,Applied Mathematics
Cc: r-help at r-project.org
Subject: Re: [R] ggplot: dodge positions

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
Nestec Ltd,
Nestl? Research Center
PO Box 44
CH-1000 Lausanne 26
Phone: +41 21 785 8220
Fax: +41 21 785 9486

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