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st: RE: RE: graph mean and sd over/by category


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: graph mean and sd over/by category
Date   Mon, 10 Feb 2003 23:10:41 -0000

george hoffman earlier wrote 

> > 1. is there a command to graph mean (as dot or bar) and +/-
> > error bars (sd,
> > se, ci, whatever) of a variable over/by categorical
> > variable? in stata5-6, i
> > used joanne garrett's predxcat with my own modifications.
> > i've spent hours
> > with the manuals, online help, menus, decomposing ado
> > files, but can't find
> > a straightforward way to do it. an ado-approach would be to
> > 'oneway y x',
> > capture the coeffecients and sd's, and graph them somehow -
> > but should i
> > have to program to get mean+/-sd graphically?  I would
> > think this would
> > still be a highly desired common graphics option. what am 
> i missing?

and I replied 

> I have a -ciplot- sitting on my machine. No help file yet.
> I will issue ASAP.
> 
> It shows means +/- ci as calculated by -ci-.

In addition to -ciplot-, which is now done and awaiting 
launch on SSC, don't forget -serrbar-, e.g. 

. egen sd = sd(mpg), by(rep78)
. egen mean = mean(mpg), by(rep78) 
. egen tag = tag(rep78) 
. serrbar mean sd rep78 if tag 

Arbitrary categorical variables can be mapped 
to groups by 

. egen group = group(catvar), label 


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

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