ggplot: dodge positions

-----Original Message-----
From: thorn.thaler at rdls.nestle.com
Sent: Mon, 2 Jul 2012 15:40:48 +0200
To: jrkrideau at inbox.com, r-help at r-project.org
Subject: RE: [R] ggplot: dodge positions

Unfortunately I can't see your example as the page is blocked by our
firewall. Anyways, if I try the dodge code, the points are shifted, yet
they are all shifted by another offset. It makes that the green points
for instance are indeed closer to the green boxplot, yet they are not
aligned meaning that all green plots seem to have a different position on
the x-axis, while all the green points for x == "A" should align exactly
with "A". Am I clearer now?

KR,

-Thorn

-----Original Message-----
From: John Kane [mailto:jrkrideau at inbox.com]
Sent: Montag, 2. Juli 2012 15:21
To: Thaler,Thorn,LAUSANNE,Applied Mathematics; r-help at r-project.org
Subject: RE: [R] ggplot: dodge positions

I don't think I was clear. Sorry.  What I was refering to was the

ggplot(ddf, aes(x, y, colour=grp)) + geom_boxplot() +
geom_point(aes(ymax=max(y)),
position = position_dodge(width=.75))

which is giving me http://www.mediafire.com/i/?fdurpq6e6l8cu35 which
was what I though you want.

I have no idea how the x axis points on the boxplot are  determined.
It may be relatively clear in the code but I don't really have the
knowledge to ferret it out.

Sorry that I cannot be of more help.

John Kane
Kingston ON Canada

-----Original Message-----
From: thorn.thaler at rdls.nestle.com
Sent: Mon, 2 Jul 2012 15:10:33 +0200
To: jrkrideau at inbox.com, r-help at r-project.org
Subject: RE: [R] ggplot: dodge positions

I guess it works with ggplot but not with ggplot2. I'm using only the
latter but had a typo in my first post. So the code (which does not

do

what I want) is:

library(ggplot2)
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()

Thinking of it, I would need to find out which offset ggplot uses to
dodge the nested factors. If I knew the exact quantity, I could do
something like

geom_point(aes(x = offset.used.by.geom_boxplot))

So how are the exact positions on the x-axis for geom_boxplot

determined?

Any ideas?

Thanks for the help, anyways.

KR,

-Thorn

-----Original Message-----
From: John Kane [mailto:jrkrideau at inbox.com]
Sent: Montag, 2. Juli 2012 15:04
To: Thaler,Thorn,LAUSANNE,Applied Mathematics; r-help at r-project.org
Subject: RE: [R] ggplot: dodge positions

Can you expand a bit on what is wrong with the dodge option?  From

what

I see it looks lovely witht the points exactly lined with the

boxplots

for each group but perhaps I don't understand exactly what you want

.

John Kane
Kingston ON Canada

-----Original Message-----
From: thorn.thaler at rdls.nestle.com
Sent: Mon, 2 Jul 2012 11:43:03 +0200
To: r-help at r-project.org
Subject: [R] ggplot: dodge positions

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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