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


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: three mean and sd plots on the same graph?
Date   Wed, 7 Nov 2007 21:01:36 -0000

Now my best advice is to use -stripplot- from SSC. Its default is to
show 
strips of data points, but you can jitter or stack and add boxes or
bars. 

. sysuse auto
(1978 Automobile Data)
. stripplot trunk turn mpg, bar

. stripplot trunk turn mpg, bar  

. stripplot trunk turn mpg, bar vertical

You can use a -by()- option as well. I'd recommend showing the data, 
but you can blank it out with -ms(none)-. 

By default the bars are offset from the data which may answer your 
last question. 

Joseph Wagner

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?



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