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st: RE: xtpcse (longitudinal time series): how to tsset


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: xtpcse (longitudinal time series): how to tsset
Date   Mon, 20 Feb 2006 14:57:32 -0000

I am not well informed on -xtpcse- but I note that 
your time variable will be an integer only if year 
is an even number. In general, time variables should be
integers. 

Nick 
[email protected] 

Yoshiro Nagao
 
> I tried to analyse a biannually 
> sampled data by xtpcse
> (longitudinal Prais-Winsten model)
> 
> .gen time_seq = year/2 
> .tsset person time_seq
> .xtpcse outcome exposure
> 
> no time periods are common to all panels, cannot estimate
> disturbance
> covariance matrix using casewise inclusion
> r(459);
> 
> Does this error message mean that
> for each sampled year,
> even a single missing person 
> is unacceptable? 
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