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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 13:16:04 -0800
Thanks Nick, the command
. bysort OK: tab id type
will identifies values of -id- for which -type- IS or IS NOT unique.
My thanks to Nick, Elizabeth and Sergiy all for the advice.
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 1:08 PM, Nick Cox wrote:
> In addition to several useful comments in this thread, note that the
> thread started earlier today in
> http://www.stata.com/statalist/archive/2013-11/msg00512.html asks an
> essentially similar question.
>
> If it's OK to be either 0 (always) or 1 (always) then a direct
> evaluation of that is
>
> bysort id (type) : gen OK = inlist(type, 0, 1) & (type[1] == type[_N])
>
> after which
>
> edit if !OK
>
> or
>
> list if !OK
>
> identifies problems.
> Nick
> [email protected]
>
>
> On 13 November 2013 20:50, Sergiy Radyakin <[email protected]> wrote:
>> On Wed, Nov 13, 2013 at 3:42 PM, Michael McCulloch
>> <[email protected]> wrote:
>>> Thanks Elizabeth, yes it's all -id-, where "sometimes type==0, sometimes type==1, that I'm looking for.
>>
>> which means sd(type)!=0 within an ID group, hence see my code.
>> to see particular IDs: tabulate id if flag
>> to drop all 'problematic' obs: drop if flag
>> Sergiy
>>
>>>
>>> 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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>>>
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