bysort x y : gen z =_N
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Thomas J. Steichen
[email protected]
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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of mai mai
Sent: Monday, November 26, 2007 2:04 PM
To: [email protected]
Subject: st: Counting interactions within a group
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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* http://www.ats.ucla.edu/stat/stata/
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*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
