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st: three mean and sd plots on the same graph?


From   Joseph Wagner <joseph.wagner@wright.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: three mean and sd plots on the same graph?
Date   Wed, 07 Nov 2007 15:46:58 -0500

I created box plot graph with of 3 X variables over the same Y variable but was then asked to produce a similar graph this time using mean (not median) and +/- 95% CI. I don't think Stata can do this but thanks to a post by Nick three years ago, I was able to (sort of) create these:

egen mean = mean(cont), by(cat) egen sd = sd(cont), by(cat) gen upper = mean + sd
gen lower = mean - sd
scatter mean cat || rcap upper lower cat
. . . is the example Nick gave but how would (or could I?) do this for three different X variables (in Nick's example I suppose it would be 3 different 'cont' variables) on the same graph? I can do this for two but not 3 which brings me to my next problem:
The box plots I created earlier were each side by side for the same value of X (rather than on top of one another) but the two -rcap- graphs are on top of each other making it impossible to differentiate the two lines (three would be even worse). Is there a way to separate these lines or do I need to graph these data in another way altogether?
Thanks for your help.



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