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st: Subtracting observations by group
From
AGAOGLU Enes <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: Subtracting observations by group
Date
Fri, 21 Jun 2013 14:45:11 +0000
Dear Stata-listers,
I have the following dataset and I would like to subtract price by groups.
date group price
2010m1 1 10
2010m2 1 15
2010m3 1 12
2010m1 2 9
2010m2 2 21
2010m3 2 15
2010m1 3 8
2010m2 3 20
2010m3 3 16
For instance, if I want to subtract group 1's prices from group 3's prices, the new variable should be the following:
newvar
2
-5
-4
Since observations are in the same variable(price), I couldn't figure out how to do it. I tried to create a new variable only for group 1 and group 3, but then it looked like the following. Thus, I couldn't subtracted g1 from g3.
g1 g3
10 .
15 .
12 .
. 8
. 20
. 16
Thank you in advance for any help,
-Enes
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