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st: Re: gen lag variable


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: gen lag variable
Date   Thu, 3 Aug 2006 08:52:17 -0400


tsset company year
gen lagroa = L.roa

There are many good reasons to avoid the use of [_n-1] in favor of Stata's time series operators: L., D., F., etc.


Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


On Aug 3, 2006, at 2:33 AM, statalist-digest wrote:


I have a panel data for 1200 firms by year (10 years for each firm)
I need to create a lagged variable of one called roa but it must be lagged
for each firm
I tried with
by empresa: egen lagroa= roa[_n-1]
but the command give me this error: r(198)
What can I do?
Thanks
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