Thank.
----- Original Message -----
From: Thomas Speidel <[email protected]>
Date: Wednesday, June 1, 2005 12:35 pm
Subject: st: Duplicates drop
> When using duplicates drop, Stata will keep the first occurrence and
> drop any subsequent ones. If you want to selectively drop specific
> duplicates, then I suggest you do it manually, for example:
>
> bysort id: gen dup=_n
> gen dup2="YES" if dup>1
> replace dup2="NO" if dup==1
>
> then, you can selectively drop the observations you want according to
> the value of some other variable, for example:
>
> drop if dup2=="YES" & some_variable=="something_value"
>
> Hope this helps,
> Thomas
>
> Thomas Speidel
> Statistical Associate
> Department of Oncology
> Tom Baker Cancer Centre
> 1331 - 29th Street N.W.
> Calgary, AB, T2N 4N4
>
> Tel. (403) 521-3370
> Email: [email protected]
>
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