
From  "Michael Blasnik" <michael.blasnik@verizon.net> 
To  <statalist@hsphsun2.harvard.edu> 
Subject  Re: st: RE: Quick Question on how to drop individual observations 
Date  Fri, 16 Jun 2006 14:26:07 0400 
Thanks for the reply. This is exactly what I needed. I have one more slightly related question.
Suppose I have a data set such as:
obs 1 hhold 1 rd 1 income 5
obs 2 hhold 1 rd 2 income 10
obs 3 hhold 1 rd 3 income 6
obs 4 hhold 2 rd 1 income 10
obs 5 hhold 2 rd 2 income 10
obs 5 hhold 2 rd 3 income 12
I want to find the change in income across each round.
So, I would like to create a variable incomedifference
where:
obs 1: incomedifference = 0
obs 2: incomedifference = 5 (10  5 = 5)
obs 3: incomedifference = 4 (6  10 = 4)
obs 4: incomedifference = 0
obs 5: incomedifference = 0
obs 6: incomedifference = 2
Thanks in advance,
Jeff
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