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RE: st: RE: identifying observations where multiple conditions are met


From   "Allred, Elizabeth" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   RE: st: RE: identifying observations where multiple conditions are met
Date   Wed, 13 Nov 2013 20:49:30 +0000

Got ahead of myself!

Collapse (max) not (sum). Sum could give you a number > 1 for both var zero and var one and then the if condition won't be met.

gen zero=1 if type==0
gen one=1 if type==1
sort id
collapse (max) zero one, by(id)
l id if zero==1 & one==1



-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Michael McCulloch
Sent: Wednesday, November 13, 2013 3:43 PM
To: [email protected]
Subject: Re: st: RE: identifying observations where multiple conditions are met

Thanks Elizabeth, yes it's all -id-, where "sometimes type==0, sometimes type==1, that I'm looking for.

The code you suggest makes sense, however at the -collapse- stage, the records disappear -id- in which the "sometimes 0 / sometimes 1" existed prior to -collapse-.



Best wishes,
Michael McCulloch

--
Pine Street Foundation, since 1989
124 Pine Street | San Anselmo | California | 94960-2674  
P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org

On Nov 13, 2013, at 12:29 PM, Allred, Elizabeth wrote:

> On further reading, I see... You're trying to find ids with "mixed messages," i.e., sometimes 0 sometimes 1.
> 
> gen zero=1 if type==0
> gen one=1 if type==1
> sort id
> collapse (sum) zero one, by(id)
> l id if zero==1 & one==1
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of Michael McCulloch
> Sent: Wednesday, November 13, 2013 3:14 PM
> To: [email protected]
> Subject: st: identifying observations where multiple conditions are met
> 
> Hello,
> I have data of the structure:
> 	id 		(range 1 to 300)
> 	type 	(for each -id-, should equal only one of two values: 0 or 1).
> 
> In manual inspection of the data, I see instances exist where, for the same -id-, 
> 	some records have type==0, and  
> 	other records have type==1.
> 
> If I enter 
> 	. tab id if type==0 & type==1
> obviously "no observations" is returned.
> 
> How would I write a command in which I can tabulate all -id- for which some observations exist where type==0, and others where type==1? (At data entry, -type- should have unique for each -id-.)
> 
> 
> Best wishes,
> Michael McCulloch
> 
> --
> Pine Street Foundation, since 1989
> 124 Pine Street | San Anselmo | California | 94960-2674  
> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org
> 
> 
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