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Re: st: collapse prob


From   Svend Juul <SJ@SOCI.AU.DK>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: collapse prob
Date   Tue, 20 May 2008 10:38:22 +0200

Martin Weiss wrote:

In this example, does your Stata complain about a "name conflict" as
well?

**************
webuse college, clear
collapse (mean) gpa (median) gpa [fw=number], by(year)
**************

In effect, you cannot calculate two statistics for the same variable
without
renaming one of the results. This is mentioned in [D] collapse at the
bottom
of page 48, but rather cursorily. And correct me if I am wrong, but
there is
just no way you could have these statistics renamed in the dialog box.
You
must first find out that you have the problem I am describing, and
second
edit the command line to 

**********
webuse college, clear
collapse (mean) meangpa=gpa (median) mediangpa=gpa [fw=number], by(year)
**********

to make this work. It took me quite some time to find that out...

================================================================

In the dialog box you can type in the variable field:

    meangpa=gpa

Logically, I think it is obvious that two different pieces of
information must have different names.

Svend
__________________________________________

Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000  Aarhus C, Denmark
Phone:  +45 8942 6090
Home:   +45 8693 7796
Email:  sj@soci.au.dk
__________________________________________ 


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