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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