Re: [R] Estimate Fisher Information by Hessian from OPTIM

2007-05-31 Thread Katharine Mullen
ChenYen wrote: > Dear All, > I am trying to find MLE by using "OPTIM" function. > > Difficult in differentiating some parameter in my objective function, I > would like to use the returned hessian matrix to yield an estimate of > Fisher's Information matrix. > > My question: Since the hessian is c

[R] Estimate Fisher Information by Hessian from OPTIM

2007-05-29 Thread ChenYen
Dear All, I am trying to find MLE by using "OPTIM" function. Difficult in differentiating some parameter in my objective function, I would like to use the returned hessian matrix to yield an estimate of Fisher's Information matrix. My question: Since the hessian is calculated by numerical differ