st: regh's predict options!

["mazdak mohtasham" <mazdak.mohtasham@gmail.com>]

Hi everyone!
I'm runnig Stata 8.2
When I use regh for the case of multiplicative heteroscedasticity,
I couldn't use predict, zg.
Stata display message of "option not allowed" any time I use predict, zg.
I don't know what to do with this case.
Thank you,
Mazdak Mohtasham
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