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And Nick`s http://www.stata.com/support/faqs/data/distinct.html
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Oliver
Weidenmueller
Gesendet: Freitag, 2. Oktober 2009 16:49
An: [email protected]
Betreff: st: counting members of groups in unbalanced panel data
Hello everyone
I am having troubles figuring out how to in a panel data structure to derive
some descriptives.
In my data
- there are mutliple companies, each having 1 to many funds
- each fund being of one of 11 strategies
- each fund only showing observations for part of the total sample period.
I require
- the total number of companies per month
- the average (median, max) number of funds per company per month
- the average (median, min, max) number of strategies per company per month
The data format is for example like this:
CompanyID FundID Strategy Date Return
3021 205 2 Jan 94 X
3021 205 2 Feb 94 X
3021 405 3 Jan 94 X
4671 904 9 Feb 94 X
4671 904 5 Mar 94 X
4671 154 1 Mar 94 X
...
Number of funds per family per month was easy:
by companyid mydate ,sort: egen perfamnrofunds = count(R)
But now I ran into troubles. I would greatly appreciate if anyone could
help.
Thanks in advance,
Best regards,
Oliver
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