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st: RE: Possible to have different colours for by() groups in histogram?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Possible to have different colours for by() groups in histogram?
Date   Tue, 3 Nov 2009 20:42:48 -0000

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. twoway histogram ease if group==1, color(red) gap(5) discrete freq
by(group) ///
|| histogram ease if group == 2, color(blue) by(group, legend(off))
discrete freq xla(1/5)  gap(5)

Nick 
n.j.cox@durham.ac.uk 

Philip Jones

I would like to know if it is possible in Stata to have different
colours for plots in histograms created using the by() option. For
instance, if I would like to plot frequencies of a Likert scale about
the ease of a process (from 1 to 5) in two separate groups, I can
generate a nice histogram using the by() option, but both "sides" (or
plots) of the graph are the same colour.

For instance,

input group ease
1 1
1 2
1 3
1 3
1 3
1 3
1 4
1 5
1 5
2 2
2 2
2 2
2 3
2 3
2 4
2 4
2 5
2 5
end
graph twoway histogram ease, by(group) discrete frequency xtick(1(1)5)
xlabel(1(1)5) gap(5) color(red)

This gives me a histogram, but I would like a different colour for each
plot - say red for the plot on the left and blue for the one on the
right.

I am sure there is a trivial way of achieving this, but I haven't been
able to find it. The barlook_options are not valid for histograms, and
using the graph editor to alter the colour also results in both plots
becoming the same colour.

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