Hi all,

I am running nlsur estimations and I am experiencing some difficulty in convergence. Out of 26 parameters to be estimated, 1 is constrained by Stata to zero (ra0) and another one (ck0) tends to infinity (no standard error is estimated). I am joining the estimation output ( nlsur.pdf ). Have some of you an idea of what could be the reason behind these problems?

Thanks in advance,
Luca