search for: likellihood

...all: i want to do the probit with sample selection estimation, the following is my code: probit with sample selection can be done by stata :heckprob The heckprobll is the likelihood function shown in W.H. Greene 5th p714 ¡´ The question is the convergence is very slow compare with Stata using likellihood only. ¡´ Second i did the similar way in matlab using fminsearch , the estimated value is close to true value, however, R gave wrong result, far away the true value. Is there any way to correct the estimation in R and speed up the algorithm. y1 is the selection equation y2 is the probit equati...