You are avoiding the command -duplicates-
and doing it from first principles. That
is a very good idea. -duplicates- is
just a wrapper for stuff like this.
But the three steps here can be cut to two.
bysort date_of_birth : gen dob_duplicate = _N
list id date_of_birth if dob_duplicate >= 2
Nick
[email protected]
[email protected]
> there may be a more elegant way to do this, albeit this is
> but one attempt:
>
> * obtain the number of duplicates w/in date of birth
> bysort date_of_birth: gen dob_duplicate = _N
> * tag each combination of DOB & the duplicates therein
> egen dob_tag = tag(date_of_birth dob_duplicate)
> * list the ID & DOB associated w/ each repeated DOB...
> list id date_of_birth dob_tag if dob_tag
> > I have a large database and would like to list the idnumber of all
> > subjects with the same date of birth. How do I do this? I have tried
> > .duplicate, but can figure out how to do it. Thanks.
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