[R] barplot in ggplot2

[ONKELINX, Thierry]

Dear Joshua,

You can accomplish that by setting the position argument in geom_bar to position_dodge(width = 0).

ggplot(plot.means, aes(x=index, y=means, fill=factor(hilow))) + geom_bar(position = position_dodge(width = 0.1), stat="identity")

But such a plot can be very misleading. Therefore I would suggest to use at least width = 0.1. This way the reader can see that the bars in the background starts at 0.

HTH,

Thierry

----------------------------------------------------------------------------
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium

tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey
  

> -----Oorspronkelijk bericht-----
> Van: r-help-bounces op r-project.org 
> [mailto:r-help-bounces op r-project.org] Namens Joshua Wiley
> Verzonden: dinsdag 11 mei 2010 16:42
> Aan: r-help op r-project.org
> Onderwerp: [R] barplot in ggplot2
> 
> Hello,
> 
> I am trying to make a barplot of means where the difference between
> the barheights is a different color.  My goal is to convey the same
> information as a dodged barplot, but with only four bars.  Below is
> the data I am working with, and the two plots I have tried.  The
> stacked plot would be great, if they were stacked in front of each
> other.  Any ideas on how to do this would be appreciated.
> 
> Thanks,
> 
> Josh
> 
> ##############################
> plot.means <- structure(list(means = c(2.35, 1.8, 2.26086956521739,
> 1.90909090909091, 1.88333333333333, 1.73846153846154,
> 1.93333333333333, 1.75), hilow = c(0, 1, 0, 1, 0, 1, 0, 1), index =
> c(1L, 1L, 2L, 2L, 3L, 3L, 4L, 4L)), row.names = c(NA, -8L), .Names =
> c("means", "hilow", "index"), class = "data.frame")
> 
> ##Uncomment below if ggplot2 is not already loaded
> #library(ggplot2)
> ggplot(plot.means, aes(x=index, y=means, fill=factor(hilow))) +
> geom_bar(position="dodge", stat="identity") #dodged plot
> ggplot(plot.means, aes(x=index, y=means, fill=factor(hilow))) +
> geom_bar(stat="identity") #stacked plot
> 
> ##############################
> 
> 
> --
> Joshua Wiley
> Senior in Psychology
> University of California, Riverside
> http://www.joshuawiley.com/
> 
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