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RE: st: collapse prob


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: collapse prob
Date   Wed, 21 May 2008 12:17:44 +0100

I agree with Svend, but Martin's is a understandable wish. 

This is a trickier problem that might first appear. For example,
variable names might be too long to allow a simple prefix or suffix.
Whatever way of shortening the name is used, there is still a need to
maintain distinct names. This kind of problem arises with other
commands, such as -xi-, but producing good defaults could easily add a
lot of code to -collapse-. 

Rightly or wrongly, Stata makes this your problem. 

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

Martin Weiss

True, but I would want Stata to take care of the naming automatically.
E.g.,
prepend or append the name of the stat being calculated so that "(mean)
gpa"
becomes "mean_gpa" in the output...

Svend Juul

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.


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