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


From   Yoshiro Nagao <[email protected]>
To   [email protected]
Subject   st: xtpcse (longitudinal time series): how to tsset
Date   Mon, 20 Feb 2006 23:52:03 +0900 (JST)

Dear all,

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? 

Your suggestion would be appreciated.

Yoshiro

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