Non Linear, Regression, R, Modelling.
much better. Let's try again, changing the control measures and from a single list of starting coefficients. control1<-nls.control(maxiter=100, tol=1e-10, minFactor=1/100000000, warnOnly=T) regr.nls<-nls(formulaExp,start=list(P=2.48, Ks=0.014, B=1.52, Ka=0.00059, Ke=0.00690),control=control1,