how about:
collapse (max) dum1 dum2 dum3 dum4, by(id)
Tim
On Fri, Feb 20, 2009 at 7:31 PM, <[email protected]> wrote:
> Dear all
>
> I wanna get from
>
> id dum1 dum2 dum3 dum4
> 1 1 0 0 0
> 1 0 1 0 0
> 1 0 0 0 1
> 2 0 1 0 0
> 2 0 0 1 0
> 3 1 0 0 0
> 3 0 1 0 0
> 3 0 0 1 0
> 3 0 0 0 1
> 4 0 1 0 0
> 5 1 0 0 0
> 5 0 0 1 0
>
> to
>
> id dum1 dum2 dum3 dum4
> 1 1 1 0 1
> 2 0 1 1 0
> 3 1 1 1 1
> 4 0 1 0 0
> 5 1 0 1 0
>
>
> Does anyone have an idea?
>
> Thanks!
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