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st: to write _n in [./.] form

From   ajjee <>
Subject   st: to write _n in [./.] form
Date   Fri, 25 Feb 2011 10:59:32 -0800 (PST)

Dear All

I have to calculate a variable in this way

gen awc_4=1 if awc[_n]==1 & awc[_n+1]!=1 & awc[_n+2]!=1 &  awc[_n+3]!=1 & 

and on basis of the above variable, generate a new variable of average

gen rgg3avgf=( rgg[_n]+ rgg[_n+1]+ rgg[_n+2])/3 if  awc_4[_n-1]==1

Is there a way to write the above commands in short form ( like, _n/_n+3) as
for other variables I've to include more terms in calculation of awc_3y and
also for higher term in averages.

Thanks in advance

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