Gabor Grothendieck <ggrothendieck <at> gmail.com> writes: > > What does "no success" mean? > > Some things to try are: > > - since log(1-Ne/No) is linear in Ne and run an lm(log(1-Ne/No) ~ Ne) > and then use the implied values from that or use them as starting > values, > > - reparameterize a*(b*Ne-T) to aa*Ne + bb and try nls on that > > On Wed, Apr 28, 2010 at 9:13 AM, bsnrh <bsnrh <at> leeds.ac.uk> wrote: > > > > Thank you for your reply. > > > > The equation is derived from Juliano's chapter in Scheiner and Gurevitch > > (2001) on Functional Responses. > > > > I have tried calling T<-24 and rerunning with no success sadly.
You should really try the methods I suggested ... you can get a closed-form expression for the number eaten as a function of the other parameters using the Lambert W function. I don't think what you're doing (with Ne on both sides of the equation) is ever going to work ... Ben Bolker ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
