[R] Combining two histograms
Sean Davis
sdavis2 at mail.nih.gov
Wed Feb 2 14:42:22 CET 2005
I have data like:
a <- rnorm(20000)
b <- rep(FALSE,20000)
b[sample(1:20000,15000)] <- TRUE
Using Lattice graphics, I can produce two side-by-side histograms quite
easily by:
histogram(a | b)
However, I would like to produce a "single" histogram with two bars
within each bin, one for each group, as the groups are in reality very
slightly different from each other. The difference isn't evident
unless one "overlays" the two histograms in some manner.
Thanks,
Sean
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