Re: [R] nonlinear regression: nls, gnls, gnm, other?

2007-01-16 Thread Turner, Heather
started, Heather -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Johann Hibschman Sent: 16 January 2007 04:05 To: Turner, Heather; r-help Subject: [R] nonlinear regression: nls, gnls, gnm, other? Hi all, I'm trying to fit a nonlinear (logistic-like

Re: [R] nonlinear regression: nls, gnls, gnm, other?

2007-01-16 Thread Prof Brian Ripley
- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Johann Hibschman Sent: 16 January 2007 04:05 To: Turner, Heather; r-help Subject: [R] nonlinear regression: nls, gnls, gnm, other? Hi all, I'm trying to fit a nonlinear (logistic-like) regression, and I'd like to get some

[R] nonlinear regression: nls, gnls, gnm, other?

2007-01-15 Thread Johann Hibschman
Hi all, I'm trying to fit a nonlinear (logistic-like) regression, and I'd like to get some recommendations for which package to use. The expression I want to fit is something like: y ~ A * exp(X * Beta1) / (1 + exp(-(x + X * Beta2 - xmid)/scal)) Basically, it's a logistic function, but I want