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st: Counting interactions within a group


From   "mai mai" <mai7777@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Counting interactions within a group
Date   Mon, 26 Nov 2007 14:04:03 -0500

Hi,
I have the following data, I want to count the number of times x
interacts with a specific y within each id, I want to create z:
id    x    y   z
s     1    1   1
s     1    3   2
s     1    3   2
s     1    4   1
s     2   1    2
s     2   1    2
s     2   3    1
s     2   4    1
f     1    1    1
f     1    2    2
f    1    2     2
f..........


Many thanks
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