Chris, 1.
This code will give you the boxplot that you want. library(ggplot2) series <- c('C2','C4','C8','C10','C15','C20') ids <- c('ID1','ID2','ID3') mydata <- data.frame(SERIES=rep(series,30),ID=rep(ids,60),VALUE=rnorm(180)) ggplot(mydata, aes(y = VALUE, x = factor(1))) + geom_boxplot() + scale_x_discrete("") But the real power of ggplot2 is when you want a boxplot for each category: ggplot(mydata, aes(y = VALUE, x = series)) + geom_boxplot() 2. Overlaying boxplots and density plots seems a bad idea to me as both plots are likey to have a different scale. HTH, Thierry ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 [EMAIL PROTECTED] www.inbo.be Do not put your faith in what statistics say until you have carefully considered what they do not say. ~William W. Watt A statistical analysis, properly conducted, is a delicate dissection of uncertainties, a surgery of suppositions. ~M.J.Moroney -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Chris Friedl Verzonden: woensdag 27 februari 2008 5:58 Aan: r-help@r-project.org Onderwerp: [R] ggplot2 boxplot confusion Ultimately my aim is to get a plot of density faceted by 2 factors with a horizontal boxplot overlaid on each density plot in the grid to indicate summary stats. So I've been experimenting with creating boxplots and density plots. Here's some representative data. series = c('C2','C4','C8','C10','C15','C20') ids = c('ID1','ID2','ID3') mydata <- data.frame(SERIES=rep(cases,30),ID=rep(ids,60),VALUE=rnorm(180)) 1. Using R default graphics I can create a boxplot of data independent of factors as follows: boxplot(mydata$VALUE) But I can't see how to do this with ggplot2. All the examples in the help show x and y aesthetics. How to boxplot a single vector? (I saw a reference to a "group" parameter in R-help somewhere but can't find it in the ggplot2 help pages. Is this a case of group = identity ?) 2. I've read the density plot help and noticed the reference to ..density.. as a means to pass density data instead of original data. But I can't seem to get a boxplot to overlay a density plot. This is what I've got so far with consequent error message: m <- ggplot(mydata, aes(x=VALUE)) m + geom_density()+ geom_boxplot(aes(x=..density..)) Error in data.frame(..., check.names = FALSE) : arguments imply differing number of rows: 0, 180 I've tried y=..density.., both x= and y = ..density.. and neither and all fail somehow. Problem is I don't really understand what I'm doing at this point. So can anyone help me out with this? thanks -- View this message in context: http://www.nabble.com/ggplot2-boxplot-confusion-tp15706116p15706116.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.