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st: differencing


From   Gregor Franz <gfranz@uci.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: differencing
Date   Mon, 14 Nov 2005 22:33:38 -0800

Hi I wasn't able to find anything on the archives adressing this issue.

My data is structured as follows

year state county employment
1 1 1 10
2 1 1 20
1 2 1 15
2 2 1 30
...
for 6 years, 50 states, and some counties in each state. I have 1.5 million observations.

I want to construct a variable that is the difference in employment by year in each state and county.

I tried

by year state county, sort: gen newvar = employment-employment[_n-1] but that didn't work.

Any suggestions?
Thank you!

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