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st: RE: FW: time variable year limit

From   "Nick Cox" <>
To   <>
Subject   st: RE: FW: time variable year limit
Date   Thu, 23 Aug 2007 18:27:33 +0100

It seems to me that Stata is telling you the problem,
very precisely. So, you need to look even more closely 
at your data. 

. duplicates list id year 

is one further step. Sort order is not relevant here. 


Alan Williamson
> I have two sets of panel data which is the same format, only 
> the value is different. I just finished one set of the model 
> testing. But the other set of the data could not work at all.
> I got 
> . tsset id year
> repeated time values within panel
> r(451);
> . isid id year
> variables id year do not uniquely identify the observations
> r(459);
> Actually my data was sorted by id (panel-firms) and year 
> (time variable-1990-2005). When I describe it, the data was 
> sorted by id year. However, no matter what I do, it is not 
> accepted at all. 

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