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st: Re: Lag variables

From   Alice Jones <>
Subject   st: Re: Lag variables
Date   Wed, 6 Mar 2013 04:32:16 +0000

Dear Statalisters,

I am analysing firm performance on a balanced panel over a period of 9
years. I create a variable SIZE which measures firm size in the first
year of the sample period and regress this against firm performance
over the 9 year period.

I run the following command to create the size variable:

gen SIZE = employment if year==1991

However, when I run the regression:


I get the error message, No observations.

Can someone please help me out with this?


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