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st: detecting repeated ID's


From   David Jones <[email protected]>
To   [email protected]
Subject   st: detecting repeated ID's
Date   Mon, 5 Aug 2013 15:45:17 -0400

Hi Statalist,

I have a dataset of property sales that has an identifier for the
property ID. I want to know how many of the properties appear more
than once and then from there I'd like to restrict the observations to
only those that appear more than once (to see a change in sale value).

I've been doing some reading but so far haven't run across a way to do
this very easily. Does anyone have any suggestions?

Thanks!
David
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