[R] ggplot: dodge positions

[Thaler,Thorn,LAUSANNE,Applied Mathematics]

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,
> >>> Nestlé Research Center
> >>> PO Box 44
> >>> CH-1000 Lausanne 26
> >>> Phone: +41 21 785 8220
> >>> Fax: +41 21 785 9486
> >>
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