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st: RE: Duplicates order tagging


From   "Jesper Lindhardsen" <JESLIN01@geh.regionh.dk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Duplicates order tagging
Date   Fri, 28 Oct 2011 08:34:07 +0200

Try 

bysort letter: gen order = _n

HTH

Jesper

Jesper Lindhardsen
MD, PhD candidate
Department of Cardiovascular Research
Copenhagen University Hospital, Gentofte
Denmark



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Ben Hoen
Sent: 28 October 2011 06:28
To: statalist@hsphsun2.harvard.edu
Subject: st: Duplicates order tagging

Hello,

If I have a set that contains the following values:

	letter
1.	A
2.	A
3.	A
4.	B
5.	B
6. 	C

I can use .duplicates tag, g(freq) to generate a count of the
duplicates:

	letter	freq
1.	A	3
2.	A	3
3.	A	3
4.	B	2
5.	B	2
6. 	C	1

But I would also like to generate an order variable (e.g., " order")
that
increases for each successive iteration of the variable.  Such as:

	letter	freq	order
1.	A	3	1
2.	A	3	2
3.	A	3	3
4.	B	2	1
5.	B	2	2
6. 	C	1	1

Is there an easy way to do that?

Thanks,

Ben


Ben Hoen
Principal Research Associate
Lawrence Berkeley National Laboratory
Office: 845-758-1896
Cell: 718-812-7589
bhoen@lbl.gov
http://eetd.lbl.gov/ea/emp/staff/hoen.html



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