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Re: st: Collapse and then generate the id of multilevel


From   Ulrich Kohler <kohler@wz-berlin.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Collapse and then generate the id of multilevel
Date   Fri, 19 Dec 2003 09:28:45 +0100

Saengla Chaimongkol wrote:
> Dear Statalist,
>
> I am working at the three level model(school, student and item).Thus, I
> need to collapse the data at level two because there are many students at
> the same school get the same response to each item.
>
> However, when I collapse, I need to generate the student id for each
> school. For example, I have 20 students in each school. Thus, in school1,
> the student id shoul be 1-20 or less than 20. Then school 2, the student
> id should be start at 1-20 or less than 20, etc.
>
> When I use the command
> gen cons=1
> collapse (count) wt2=cons,by(schid,item)
> gen stuid=_n
>
> Then the output gives me the stuid from 1- 789( the last observations)
>
> Could any one give me a suggestion please?

. by schid, sort: gen stuid = _n

-- 
kohler@wz-berlin.de
+49 (030) 25491-361


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