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st: lag operator and "not sorted" problem

From   Johannes Geyer <>
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 für Wirtschaftsforschung (DIW Berlin)
German Institute for Economic Research 
Department of Public Economics
DIW Berlin
Mohrenstraße 58
10117 Berlin
Tel: +49-30-89789-258

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