st: non-linear constraints

["Francesco D'Amico" <francesco.d.amico@uniroma2.it>]

Dear all,

i want to set in stata some non-linear constraints for an OLS  
regression model, but is not possible to do it with "cnsreg" and the  
option "constraint"

the model can be like the following:

y=a*x1+bc*x2+c*x3+b*x4

and the constrainst can be:

bc=b*c





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