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st: Re: How to generate lagged variables


From   "R.E. De Hoyos" <redeho@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: How to generate lagged variables
Date   Mon, 30 Aug 2004 13:13:41 +0100

sort firm year_id
tsset firm year_id, yearly
gen lsales = l.sales

Rafa

----- Original Message -----
From: "hotmail" <n5n5308@hotmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, August 30, 2004 9:03 AM
Subject: st: How to generate lagged variables


> I have an unbalanced panel with 100 firms, 4 years, and about 300 obs.
> Some firms provide information for all empirical years, while others
provide
> for less than 4 periods.
> Using this panel, I need to create lagged variables such as SALES(-1).
> Which command in Stata7-SE should I use to do this?
> Thank you in advance.
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