Re: [R] Need help on Newton-Raphson optimization

2011-08-10 Thread Berend Hasselman
michael wrote: > > Hi, > > Is there available package on the optimization function using > Newton-Raphson method (iterative quadratic approximation)? I have been > using > the 'optim' function in R and found it really unstable (it depends heavily > on the initial values and functional forms

Re: [R] Need help on Newton-Raphson optimization

2011-08-10 Thread Daniel Nordlund
> -Original Message- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf Of michael > Sent: Wednesday, August 10, 2011 4:37 PM > To: r-help@r-project.org > Subject: [R] Need help on Newton-Raphson optimization > > Hi, > >

Re: [R] Need help on Newton-Raphson optimization

2011-08-10 Thread Rolf Turner
On 11/08/11 11:36, michael wrote: Hi, Is there available package on the optimization function using Newton-Raphson method (iterative quadratic approximation)? I have been using the 'optim' function in R and found it really unstable (it depends heavily on the initial values and functional f

[R] Need help on Newton-Raphson optimization

2011-08-10 Thread michael
Hi, Is there available package on the optimization function using Newton-Raphson method (iterative quadratic approximation)? I have been using the 'optim' function in R and found it really unstable (it depends heavily on the initial values and functional forms). If I have to code it by myself