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Re: st: deleting duplicate observations by date


From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: deleting duplicate observations by date
Date   Tue, 13 Jan 2009 12:49:03 +0000 (GMT)

--- Sharooon <[email protected]> wrote:

<snip> I have multiple id's observed at different dates, and not
> necessarily the same date. What I would like, is to delete all but
> the most recent date and fill in the price with the most recent price
> observed.

*----------- begin example ------------
clear
input id      date     price
1       1         400
2       1         500
2       2         450
2       3         450
3       2         600
3       3          .
end
list
gen miss = missing(price)
bys id miss (date): keep if _n == _N
drop if miss
drop miss
list
*--------------- end example ---------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      
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