\[
\eta_{ij} = \beta x_{ij} + U_i - U_j
\]
where $U_1, U_2, \ldots$ are iid $N(0, \tau^2)$.
Any suggestions would be welcomed.
David
Professor David Firth Dept of Statistics University of Warwick Coventry CV4 7AL United Kingdom
Voice: +44 (0)247 657 2581 Fax: +44 (0)247 652 4532 Web: http://www.warwick.ac.uk/go/dfirth
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