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RE: st: Keeping specific observations
From
"Cohen, Elan" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
RE: st: Keeping specific observations
Date
Fri, 31 Aug 2012 17:01:59 +0000
egen n = count(v1), by(id)
keep if n>0
HTH,
- Elan
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Eleimon Gonis
Sent: Friday, August 31, 2012 12:56
To: [email protected]
Subject: RE: st: Keeping specific observations
Hi Afif,
thanks for your reply, but no, it wouldn't work, because that command would also drop the second individual's missing value in 2001, which I want to keep.
What I'm trying to get is that if an individual has at least one non-missing value in any of the years (ID=1 and 2 in the example), they should remain, otherwise drop.
Eleimon
From: [email protected] [[email protected]] On Behalf Of Afif Naeem [[email protected]]
Sent: 31 August 2012 17:46
To: [email protected]
Subject: RE: st: Keeping specific observations
Shouldnt "drop if v1 == . " work?
Afif
> From: [email protected]
> To: [email protected]
> Date: Fri, 31 Aug 2012 17:43:47 +0100
> Subject: st: Keeping specific observations
>
> Dear Statalisters,
>
> I would appreciate your help with the following conundrum. Assume I have a dataset that looks like this:
>
> Year ID v1
> 2000 1 2
> 2001 1 2
> 2002 1 3
> 2000 2 3
> 2001 2 .
> 2002 2 3
> 2000 3 .
> 2001 3 .
> 2002 3 .
>
> What I want to achieve is to only keep those individuals that appear with any non-missing values for v1 for any of the years in the dataset.
>
> In other words, I don't think that a command: "keep if v1<." would do, because that would also take out the 2001 observation for the second individual (ID==2), which I'd like to remain in place.
>
> Any ideas are welcome,
> Eleimon
>
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