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st: RE: not uniquely identified observ in small panel

From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: not uniquely identified observ in small panel
Date   Tue, 5 Jul 2005 21:26:06 +0100

I am interested in your assertion that -duplicates- 
produces an incorrect result. But to say anything 
about it would require a sight of exactly what you 
typed and exactly what results you got, and/or a copy of the 
data, which you might care to send to me privately. 

I wasn't aware that -duplicates- had a -width()- option.  

[email protected] 

Joana Quina
> My problem is that -xtdes- says my two key variables do not together
> uniquely identify the cases in my large panel data set. I am working
> with a small panel (N=32 and T=4).
> I have no duplicates, though "duplicates report" wrongly says I have
> one dupliacate observation. Curiously, "duplicates list" correctly
> says I have none.
> This appears to have happened to the only other query I could find on
> this subject. I have tried changing width, but stata says "option
> width() not allowed".
> I don't know what else to do. It seems quite a ridiculous problem for
> such a small data set! Thank you in advance for any pointers.
> Joana
> PS - I have Stata 8

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