> >>I have a data set, and I know by the ID variable there is no duplicates,
> >>because if I use
> >>
> >>bys ID: gen count=_N
> >>tab count
> >>
> >>I get count all equal to 1.
> >>
> >>However, if I use
> >>
> >>bys ID: list varlist if N>1
> >>
> >>Stata starts to list every observation from the top.
> >>
> >>Why is this happening?
> >
> >One explanation is that your code:
> >bys ID: list varlist if N>1
> >
> >should be
> >
> >bys ID: list varlist if _N>1
> >
> >Fred
>
> This actually doesn't make any difference. Either syntax gives you the
> same result, as I confirmed with my own data after I noticed the same
> thing. I think in the syntax above, _N is not found, so that for every
> observation _N>1.
This works as it should for me. In fact the command produces the header for
each group but does not produce output within each group:
.. by index, sort: list if _N >1
_______________________________________________________________________________
-> index = 1
_______________________________________________________________________________
-> index = 2
_______________________________________________________________________________
-> index = 3
_______________________________________________________________________________
-> index = 4
etc.
regards,
uli
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