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Re: st: how to construct change in earnings since last election


From   Robson Glasscock <glasscockrc@vcu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: how to construct change in earnings since last election
Date   Sat, 11 Feb 2012 09:19:42 -0500

Try -help xtset-. Specifically, read up on the delta option and
time-series lag operator.

best,
Robson Glasscock

On Fri, Feb 10, 2012 at 6:07 PM, hnbc1 <hnbc1.reg@gmail.com> wrote:
> 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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