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Re: st: RE: counting subgroups in a large group


From   "Jesper B. Sorensen" <sorensen@mit.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: counting subgroups in a large group
Date   Fri, 06 Jun 2003 15:27:05 -0400

bysort course section: gen flag=_n==1
by course: egen nsections=sum(flag)
drop flag


At 03:42 PM 6/6/2003 -0400, you wrote:
I need to find the number of groups in a larger group: the number of *sections
in a *course. Of course, I can do this:

sort course
by course: tabulate sections

One would then count the sections by eyeballing them in the tabulation, but
in my data, a course can have many many sections.

The conceptual idea would be analgous to this fantasy coding:

by course: codebook section

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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jesper B. Sørensen
Richard S. Leghorn (1939) Associate Professor of Strategic Management
Sloan School of Management
Massachusetts Institute of Technology
E52-581
Cambridge, MA 02142
http://web.mit.edu/sorensen/www/
(617) 253 7945  -- voice
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