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Re: st: Group identifiers within group


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Group identifiers within group
Date   Fri, 7 Jun 2013 13:17:51 +0100

for "informative" read "uninformative"


Nick
njcoxstata@gmail.com


On 7 June 2013 13:17, Nick Cox <njcoxstata@gmail.com> wrote:
> -group()- here is a very old and very undocumented function. I would
> suggest now to StataCorp, and I think I have suggested before, that
> calling -group()- should be illegal except under version control.
>
> You are confusing it with the -egen- function of the same name.
>
> I think you seek
>
> egen level2 = group(GroupID AnimalID Parity)
>
> Best not to use informative variable names such as "var1".
>
> Nick
> njcoxstata@gmail.com
>
>
> On 7 June 2013 13:02,  <isabel.lechner@vetsuisse.unibe.ch> wrote:
>> Dear all,
>>
>> I'm trying to create a new variable with a group identifier, but on a 2nd level.  For the variable "GroupID" I did the following:
>>
>> by AnimalID:  gen GroupID = _n
>>
>> Is it possible to do the same but on the 2nd level (based on AnimalID AND Parity), so that I will get the values as shown in the last variable "2nd level"?
>> I've tried: by TierID: gen var1 = group(par), but this doesn't seem to do the job.  Data are sorted by AnimalID and then Parity.
>>
>>
>> AnimalID                             Parity                    GroupID              2nd level?
>> CH003381451070             3                             1                             1
>> CH003381451070             4                             1                             2
>> CH003381451070             4                             1                             2
>> CH003381462076             2                             2                             1
>> CH003381462076             3                             2                             2
>> CH003381462076             3                             2                             2
>> CH110003099108             10                           3                             1
>> CH110003099108             10                           3                             1
>> CH110003099108             11                           3                             2
>> CH110003099108             11                           3                             2
>> CH110003099108             11                           3                             2
>> CH110003099108             12                           3                             3
>> CH110003099108             12                           3                             3
>> CH110003099108             12                           3                             3
>>
>> Thanks for your help!
>> Isabel
>>
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