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Re: st: RE: identifying observations where multiple conditions are met
From
Michael McCulloch <[email protected]>
To
[email protected]
Subject
Re: st: RE: identifying observations where multiple conditions are met
Date
Wed, 13 Nov 2013 13:08:31 -0800
Thanks Sergiy for the simulation & code.
I note that the command
. tabulate id if flag
will identify both the problem observations I want to drop (where for the same -id-, that -type- is not unique, there are observations of both kinds, type==0 and type==1), but also also ones in which for -id-, that -type- is in fact unique, but there is only ONE observation.
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 12:38 PM, Sergiy Radyakin wrote:
> //------------------------------------------
> clear
> set obs 100
> gen id=floor(_n/2)
> gen type=floor(uniform()*2)
> //------------------------------------------
> sort id
> by id: egen flag=sd(type)
> replace flag=1 if flag!=0
>
> Best, Sergiy Radyakin
>
>
> On Wed, Nov 13, 2013 at 3:24 PM, Allred, Elizabeth
> <[email protected]> wrote:
>> Have you tried:
>>
>> tab id if type==0 | type==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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