st: xtfrontier - time dummies

["Arvind" <A.Yadav@lboro.ac.uk>]

I am a new user of STATA. I am using xtfrontier for an unbalanced panel data 
of 50 firms over a 20 years time span. The questions worrying me are:
Does tsset is sufficient enough to capture time effect or do I need to 
define time dummies? How I can get efficiency scores (I am trying predict, 
te)?

My data set is in this format:
Firms Year    Variables
1       1985
1       1986
1       2004
2       1985
2       1986
2       2004

Regards
Arvind.

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