
Dear all, 

I want to estimate this equation with repeated data.

log(y)=b0+b1*log(x1)+b2*log(x1)+B'Z+u

if y<=0 then log(y) is undefined.  It seem to be a tobit model with panel data, can I do this in R with nlme, lme or plm ?
If not is it valid to use a two step procedure ? 



Justin BEM
BP 1917 Yaoundé
Tél (237) 76043774


      
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