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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