dummy regression coefficient

[Ozlem]

I want to run a nonlinear panel regression. One of the coefficients is country specific, so I have something like this: exp(beta(i)*GDP(i,t)), where i denotes country and t is time. I want to estimate beta. How do I do that? I think I should use object-new object-matrix-vector-coeff, and then pick coefficient vector. But I am confused about how to set up the coefficient. Any help will be appreciated.