On Jan 29, 2008 10:15 AM, Gustaf Granath <[EMAIL PROTECTED]> wrote: > Hi, > I have measured two response variables (y1, y2) at each treatment level > (x = 0, 1.5 or 3). Now I would like to show the y1 and y2 against x in a > bar plot. However, y1 and y2 differ in scale so I need two y-axises, one > on the left side and one on the right side (and I dont want to > standardize my responses). This is fairly easy if you want to show > points,lines etc, but gets more complicated with bars.Although these > kind of bar graphs are quite common, I have found very limited > information about how to do them in R. I have been struggling with the > barplot() command. My problem is that the bars for y1 and y2 end up at > the same place (blocking each other) and not beside each other when I > use par(new=TRUE). Is there a way to separate them so y1 and y2 are > placed beside each other at each x level, or is this easier to do this > with lattice?? I would also like to add error bars but I guess that > should not be a problem.
Why don't you just use two separate plots? Using double y-axes is only desirable if one axis is a transformation of the other, or you are deliberately trying to confuse the data. If you want to learn more about why it's a bad idea, trying start with: K. W. Haemer. Double scales are dangerous. The American Statistician, 2(3):24–24, 1948. You'll note that people have been advising against them for over 50 years! Hadley -- http://had.co.nz/ ______________________________________________ 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.
