Re: st: counting the time of being in a specific state

[Edwin Leuven <e.leuven@uva.nl>]

>  id  state  year  count
> 101   4     1994   1
> 101   4     1995   2
> 101   4     1996   3
> 101   3     1997   1
> 102   1     1994   1
> 102   1     1995   2
> 102   2     1996   1
> 102   3     1997   1
> 103   4     1994   1
> 103   2     1995   1
> 103   4     1996   1

bysort id state (year): g count = _n
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