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Re: st: Group identifiers within group
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Group identifiers within group
Date
Fri, 7 Jun 2013 13:17:51 +0100
for "informative" read "uninformative"
Nick
[email protected]
On 7 June 2013 13:17, Nick Cox <[email protected]> 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
> [email protected]
>
>
> On 7 June 2013 13:02, <[email protected]> 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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