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st: RE: RE: Difference of values in the same column/variable


From   "Gokhan Yilmaz" <[email protected]>
To   <[email protected]>
Subject   st: RE: RE: Difference of values in the same column/variable
Date   Tue, 15 Nov 2011 08:35:27 -0500

Thank you very much Dr. Cox

Gokhan

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick Cox
Sent: Tuesday, November 15, 2011 4:58 AM
To: '[email protected]'
Subject: st: RE: Difference of values in the same column/variable

In your example 

bysort time (group) : gen newvar = ewportnet - ewportnet[_n-1] 

Nick
[email protected] 

[email protected]

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


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