Re: [R] vcov.nlminb

2010-03-24 Thread Ravi Varadhan
-project.org Cc: Brian Johnson Subject: [R] vcov.nlminb Hello all, I am trying to get the variance-covariance (VCOV) matrix of the parameter estimates produced from the nlminb minimizing function, using vcov.nlminb, but it seems to have been expunged from the MASS library. I also tried using th

[R] vcov.nlminb

2010-03-24 Thread Johnson, Brian P.
Hello all, I am trying to get the variance-covariance (VCOV) matrix of the parameter estimates produced from the nlminb minimizing function, using vcov.nlminb, but it seems to have been expunged from the MASS library. I also tried using the vcov function after minimizing the function with the nlm f

[R] vcov.nlminb

2010-03-24 Thread Johnson, Brian P.
Hello all, I am trying to get the variance-covariance (VCOV) matrix of the parameter estimates produced from the nlminb minimizing function, using vcov.nlminb, but it seems to have been expunged from the MASS library. The hessian from nlminb is also producing NaNs, although the estimates seems to b