fit.nls {simex} | R Documentation |
Fits a nonlinear model of the form a+b/(c+lambda) to the data. Starting values are obtained by unsing quadratic extrapolation and an analytic way to obtain a three point fit to the model.
This function is for internal use only!
fit.nls(lambda, p.names, estimates)
lambda |
vector of lambdas, for which the extrapolation should be made |
p.names |
vector of variable names |
estimates |
matrix of Simex estimates, as supplied by the functions simex |
Uses nls()
with the obtained starting values as described by Carrol, Ruppert, Stefanski.
a list of nls
-objects, names are p.names
numerical not stable, especially for constant functions
Wolfgang Lederer