[R] help with nls and Hill equation

[Christian Ritz]

Hi!

I would suggest trying out a few different starting values as a first unsystematic approach.

For example changing hill=1 to hill=2 results in convergence:

foo.nls<-nls(var~Emax*(Dose^hill)/((EC50^hill)+(Dose^hill)),
start=list(Emax=-4,EC50=269,hill=2),trace=T,data=foo)



Christian