st: bpagan test after xtreg?

[P K <statistics_2009@yahoo.de>]

Hi,

I run the Breusch-Pagan Lagrange multiplier test for heteroscedasticity after a random effects panel model.
However, it does not work in STATA - I get the error message  

last estimates not found
r(301);


Is the bpagan test not feasible after the xtreg command (ie can it only be used after the regress command?)? I read in several papers that 
people used it after the xtreg command, too.

If feasible, do I have to store the estimates before running the bpagan option? If so, how?

Thanks,
Patricia


      

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