In ggplot2, I would like to make a boxplot that has the following properties:
(1) Contrary to default, the meaningful axis should be the horizontal axis. Lattice does this, for instance, by library(lattice);bwplot(~mtcars$mpg) (2) It is *univariate*, i.e., of a single vector, say mtcars$mpg. I do not wish to make separate plots for the different values of mtcars$cyl. (3) Nothing on the meaningless axis--the axis that does not correspond to values of mtcars$mpg, the axis which by default is horizontal--should suggest a scale. Thus, there should be no axis title or label; there should be no axis ticks. Partial solutions: To achieve (1), one might save a vertical plot (with mpg on the y-axis) as a pdf and use Adobe Acrobat to rotate it 90 degrees. But is there not a way to do this *within* ggplot2? Since ggplot2 has been carefully thought out starting with the grammar of graphics, I wonder if there is some conceptual argument against making univariate boxplots and against boxplots with a horizontal continuous axis. But in teaching an introductory statistics course, I would like to compare the ways that a histogram and a boxplot summarize a single continuous variable. Thus I would like the continuous axis to be horizontal in both plots. The following code achieves (2) and part of (3): library(ggplot2) qplot(factor(0), mpg, data=mtcars, geom="boxplot", xlab="")+ opts(axis.text.x = theme_blank(), axis.ticks=theme_blank()) but to remove the ticks from the meaningless (horizontal) axis I had to also remove the ticks from the meaningful (vertical) axis. On page 143 of Wickham's ggplot2 book, I find axis.ticks as a theme element but nothing like axis.ticks.x. Is there a way to remove the axis ticks from the x axis and not from the y axis? But, more important: How do I make a boxplot that is rotated (or transposed) from the default, so that the x axis carries the information? Thanks Jacob A. Wegelin Assistant Professor Department of Biostatistics Virginia Commonwealth University 730 East Broad Street Room 3006 P. O. Box 980032 Richmond VA 23298-0032 U.S.A. ______________________________________________ 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.
