st: xtset question

["Sharif S. Aly" <saly@ucdavis.edu>]

Dear list,
xtset will not allow declaring more than 2 variables, a panel and a time 
variable, the latter has to be understandably not repeated within a 
panel. What if there is more than 1 panel variable with  repeated time 
values within any 1 of those panels but not within all panels.  In my 
example, a 4 level mixed effects negative binomial model (hence I needed 
to xtset my dataset to use xtnbreg) with time as the lowest factor level.
Any solutions are greatly appreciated?

Best regards,
Sharif



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