st: Problem with var command

[Claude Francoeur <claude.francoeur@hec.ca>]

Hello,

I am getting an error using the var command :

. sort id year

. tsset id year
       panel variable:  id (strongly balanced)
        time variable:  year, 2004 to 2005

. var csp roa, lag(1)
repeated time values in sample ???
r(451);

What could be the problem? My panel consists of 179 firms (id) perfectly 
balanced between 2 years (2004-2005).

Thanks in advance for your advice.

Claude

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