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st: Difference of values in the same column/variable


From   yilmag@rpi.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: Difference of values in the same column/variable
Date   Mon, 14 Nov 2011 21:21:17 -0500

Dear All,

How can i create a new variable that is equal to the difference in ewportret 
(see below table) between two groups in the same month?
For example: the first row of the newvar below would be equal to (.0375245- 
.041679) and the second row would be equal to(.0397919- .0449738)


group	time	ewportret  newvar

1	2007m4	.0375245      
1	2007m5	.0397919
1	2007m6	-.0188678
0	2007m4	.041679
0	2007m5	.0449738
0	2007m6	-.0240277


Thank you

Gokhan


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