[R] ggplot2 multiple group barchart

[ONKELINX, Thierry]

Dear Greg,

First convert your data.frame to a long format using melt(). Then use
ddply() to calculate the averages. Once you get at this point is should
be rather straightforward.

library (ggplot2)

v1  <- c(1,2,3,3,4)
v2  <- c(4,3,1,1,9)
v3  <- c(3,5,7,2,9)
gender <- c("m","f","m","f","f")

d.data  <- data.frame (v1, v2, v3, gender) 

molten <- melt(d.data)

Average <- ddply(molten, c("gender", "variable"), function(z){
	c(Mean = mean(z$value))}
)

ggplot (data=Average, aes(x = variable, y = Mean, fill = gender)) + 
		geom_bar(position = position_dodge()) + 
		coord_flip() + 
		geom_text (position = position_dodge(0.5),
aes(label=round(Mean, 1)), vjust=0.5, hjust=4,colour="white", size=7)

ggplot (data=Average, aes(x = variable, y = Mean)) + 
		geom_bar() + 
		coord_flip() + 
		geom_text(aes(label=round(Mean, 1)), vjust=0.5,
hjust=4,colour="white", size=7) + 
		facet_wrap(~gender)

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

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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 Waller Gregor (wall)
> Verzonden: woensdag 1 september 2010 17:16
> Aan: r-help op r-project.org
> Onderwerp: [R] ggplot2 multiple group barchart
> 
> 
> hi there.. i got a problem with ggplot2.
> 
> here my example:
> 
> library (ggplot2)
> 
> v1  <- c(1,2,3,3,4)
> v2  <- c(4,3,1,1,9)
> v3  <- c(3,5,7,2,9)
> gender <- c("m","f","m","f","f")
> 
> d.data  <- data.frame (v1, v2, v3, gender) d.data
> 
> x  <- names (d.data[1:3])
> y  <-  mean (d.data[1:3])
> 
> 
> pl  <- ggplot (data=d.data, aes (x=x,y=y)) pl  <- pl + 
> geom_bar() pl  <- pl + coord_flip() pl  <- pl + geom_text 
> (aes(label=round(y,1)),vjust=0.5, hjust=4,colour="white", size=7) pl
> 
> this gives me a nice barchart to compare the means of my 
> variables "v1","v2" and "v3".
> my question: how do i have to proceed if i want this barchart 
> splittet by the variable "gender".
> so i get two small bars for "v1", one for female and one for 
> male, two bars for "v2" etc. 
> i need them all in one chart. 
> 
> fill=gender, position="dodge" do not work... 
> 
> any ideas?
> 
> thanks a lot
> 
> greg
> 
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