Note that
. bysort id : drop if _N == 1
is (nearly) equivalent. It's more direct;
but note the side-effect of -sort-ing.
Nick
[email protected]
Richard Williams
> >>Is there a way to have Stata identify observations that
> have equivalent
> >>values for a given variable? Speficically, I want to trim
> my dataset to
> >>individuals that live in the same household using a household id
> >>variable. I want to get rid of those that live alone. I
> tried using
> >>the egen tag and egen group commands, but that did not help.
> >
> >Is this what you want?
> >
> >. egen x = count(id), by(id)
> >
> >. drop if x==1
>
> To follow up -- if id is missing, x gets coded 0. So, if you
> have missing
> data on the id variable, and you also want such cases
> dropped, a better
> coding would be
>
> . egen x = count(id), by(id)
>
> . keep if x > 1
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