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st: overlapping histograms


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   st: overlapping histograms
Date   Mon, 29 Sep 2008 11:02:33 -0400

I've been trying to create a graph which shows
two overlapping histograms - I'm trying to show
how the distribution for a quantity if interest
has shifted from time A to time B.

Putting two histograms on one graph is not the
problem

 twoway (histogram myvarA) (histogram myvarB)


but the problem is that one obscures the other. I
can make the one on top "clear" (specify -color(none)-)
but because the bars line up it still difficult to
distinguish them. So I'm looking for a way to do
either

1. make the overlapping areas a darker color than
   either histogram is alone
2. shift the bars for one histogram so that the one
   behind can be seen ever so slightly

Is there a way to do either? Is there a better solution?

thanks in advance,
Jeph



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