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st: how to construct change in earnings since last election


From   hnbc1 <hnbc1.reg@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: how to construct change in earnings since last election
Date   Fri, 10 Feb 2012 17:07:37 -0600

Hi all, my question is as follows:
Suppose we have a panel dataset like

County Earnings Votes Change_in_earnings_since_last_election
1 10 3 .
1 20 . .
1 30 . .
1 40 4 1
2 20 . .
2 30 4 .
2 40 . .
2 50 3 -1
3 30 1 .
3 40 2 1
3 50 . .
3 60 4 2

The time dimension is year. We don't have votes every year because
counties don't have elections every year.
The variable I want to construct is
Change_in_earnings_since_last_election. As is shown in the table, only
the last observation of county 1, 2, 3, and the second observation of
county 3 have nonmissing data for this variable. How can I do this
systematically? Thank you very much.

Paul
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