Hello there, Can anyone point me to the code for logLik of an nls object? I found the code for logLik of an lm but could not find exactly what function is used for calculating the logLik of nls function? I am using the nls to fit the following model to data - Model 1: y ~ Ae^(-mx) + Be^(-nx) +c and want to understand what is the likelihood function used by nls. Presumably it is using - N(Ae^(-mx) + Be^(-nx) +c, var = residuals from nls) Thank you in advance, Diviya [[alternative HTML version deleted]]
methods(logLik) ## for S3 methods stats:::logLik.nls ### and look at the code! -- Bert On Thu, Jan 31, 2013 at 12:06 PM, Diviya Smith <diviya.smith at gmail.com> wrote:> Hello there, > > Can anyone point me to the code for logLik of an nls object? I found the > code for logLik of an lm but could not find exactly what function is used > for calculating the logLik of nls function? > > I am using the nls to fit the following model to data - > Model 1: y ~ Ae^(-mx) + Be^(-nx) +c > > and want to understand what is the likelihood function used by nls. > Presumably it is using - > N(Ae^(-mx) + Be^(-nx) +c, var = residuals from nls) > > Thank you in advance, > > Diviya > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.-- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm