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st: RE: Creating repeated index
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: Creating repeated index
Date
Wed, 20 Oct 2010 16:36:10 +0100
egen index = group(studentid visitdate)
Nick
[email protected]
Pete
I am trying to create an index/running number based upon same value of
one variable, i.e., visit date. Different visit date will have
different index/running number. I can do it by finding duplicates and
drop them, then create an index and save as a new file, then merge a
new file with the original one. However, I want to know whether there
is a short cut to do this. My data will looks like this.
StudentID Visit Date Item Index
1 1/1/2010 A 1
1 1/1/2010 B 1
1 2/4/2010 A 2
1 2/4/2010 B 2
1 2/4/2010 C 2
2 4/1/2010 A 1
2 4/1/2010 B 1
2 4/1/2010 C 1
2 3/3/2010 A 2
2 3/3/2010 E 2
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