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RE: st: Error-bars---again


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Error-bars---again
Date   Tue, 23 Jun 2009 17:16:27 +0000 (GMT)

--- moleps islon wrote:
> Looking at the number of postings requesting an option of adding
> error-bars with ci,sd or se to bar graphs I'm sure one exists but I
> still havent found an ado handling this. Is there one?
> 
> Or is there a way to do ci(b)plot over multiple categories?
> 
> ie. something akin to graph bar x, over(z) over(y)

I am not a big fan of these "detonator plots" as it encourages the
practice of "looking whether confidence intervals overlap" to test
whether means are equal. Also I don't like the representation of
means by a bar (it requires a meaningful zero for it to make sense,
and that is often lacking). Also, there are a lot better ways of 
representing the distributions of a variable across categories, 
like Nick Cox's -stripplot- (type -findit stripplot- to find it).

So my real answer is: "Don't do that". However, if you really 
really want to, you can use Roger Newson's -eclpot-. Notice that
this command is much more versatile and can create lots of 
really useful graphs besides detonator plots. It is discussed in:

Roger Newson (2003) Confidence intervals and p–values for 
delivery to the end user. The Stata Journal, 3(3):245--269.
http://www.stata-journal.com/article.html?article=st0043

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

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