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st: lag operator and "not sorted" problem

From   Johannes Geyer <[email protected]>
To   [email protected]
Subject   st: lag operator and "not sorted" problem
Date   Tue, 18 Sep 2007 15:07:14 +0200

Dear Statalisters,

I have a problem with the lag operator:
tsset id time
sort id time
replace X = l.X if X == . & l.X != . 
produces the following error:
not sorted

What is the problem with this code? Does *tsset* not ensure that we do not 
have to sort and use by... again?

Thanks for your help,


Johannes Geyer
Deutsches Institut f�r Wirtschaftsforschung (DIW Berlin)
German Institute for Economic Research 
Department of Public Economics
DIW Berlin
Mohrenstra�e 58
10117 Berlin
Tel: +49-30-89789-258

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