Re: st: Difference between variables per year

[Maarten Buis <maartenlbuis@gmail.com>]

On Wed, Nov 27, 2013 at 11:22 AM, Maurits Meijers Baumeister  wrote:
>  I am using a data set that shows party positions per election year for multiple countries.  I'm looking to create a variable that shows the difference of the party position of a particular election year with the party position of the previous election year.     Please note that elections in the data set mostly do not happen yearly, although sometimes they might.   Moreover, the election years will be the same for all parties in the same country but will differ per country.     How do I do this?

Say, your dataset contains the variables country, party, year, and
position to identify the country, party, year of the election and the
position of that party in that election. In that case I would type in
Stata:

sort country party year
by country party : gen diff = position - position[_n-1]

Hope this helps,
Maarten

---------------------------------
Maarten L. Buis
WZB
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10785 Berlin
Germany

http://www.maartenbuis.nl
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