Re: [R] nonlinear regression and Excel solver

2004-01-21 Thread Mike Prager
On Wednesday 14 January 2004 19:57, Kristian Omland wrote: [snip] Is Excel's Solver an adequate tool for numerical approximation in general and nonlinear regression in particular? Or should I push on writing S-Plus code? From what I've heard (and I know some expert users), Excel's solver is

[R] nonlinear regression and Excel solver

2004-01-14 Thread Kristian Omland
Hi all, Earlier today I posted this question on s-news, so apologies to some for the duplication. Please put aside your snobbery about Microsoft products for a moment. I am fitting population models to annual survey data for trout. For those of you familiar with ecological models, I am working

Re: [R] nonlinear regression and Excel solver

2004-01-14 Thread Arne Henningsen
Hi, I don't know S-Plus and its functions nlminb() and ms(). However, in R I would use optim(), optimize or nlm(). I used these functions quiet often and had only very few problems. I think that R is better, easier and more flexible than Excel (at least in the long run), but since I don't