Monday, February 20, 2006

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

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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