

 I am using the lattice histogram

histogram( ~ base_var   | treatment, data=mydataset )

 In my dataset, the histogram produces (as expected) two histograms,
each corresponding to one of the two treatments.
 
 I would like to have the histogram for one treatment to have, say,  red
bars, the histogram for the second treatment,  to have blue bars.

I tried the ",col=" option, but that colors individual bars rather than
the histogram.

Thanks in advance for suggestions.



    Chris Barker, Ph.D.
  Statistical Consultant


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