[R] Superposed histograms

Damon Wischik djw1005 at cam.ac.uk
Fri Jan 10 11:42:03 CET 2003

I woud like to plot cumulative histograms. Specifically,
I have data like
    Sex     M   M   F   M   F   F   M   F
    Height  6   6.3 6.1 5.5 7.2 6.2 5.9 6.0  ....
and I want to plot a histogram of the distribution of all heights,
colouring the histogram bars according to sex, for example
  |    o   
  |   oo  o  
  | o oo ** o   o = observations of women
  | o o*o***o   * = observations of men
  | *o*******

(And I want this in a Trellis plot, and with more than two groups of
observations.) How should I do this? I tried looking for imaginitive
combinations of panel.superpose and panel.histogram. I suppose if I called
panel.histogram for the cumulative data first, then panel.histogram for
just the data on men, with a different colour, I could achieve the effect. 
But I'd need to superpose the accumulated data, and panel.superpose seems
to only separate the data by group, not accumulate data by group.

Damon Wischik.

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