st: clear estimated coefficient matrix

[natasha agarwal <agarwana2@googlemail.com>]

Dear All,

I want to estimate production function for each industry and calculate
the predicted output for each industry. To do so, I estimate the
following regressions

levpet lnrval if inm==1, free(lnw) proxy(lnb) capital(lnk) valueadd
gen yhat1 = _b[lnk] * lnk + _b[lnw]* lnw if inm==1

levpet lnrval if inm==2, free(lnw) proxy(lnb) capital(lnk) valueadd
gen yhat2 = _b[lnk] * lnk + _b[lnw]* lnw if inm==2

however yhat2 takes _b of the regression where inm==1 and not inm==2.

I tried using clear matrix, scalar drop _all, but the results do not change.

Can you please help me with the same ?

Thanks,
Natasha Agarwal
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