On Mon, 8 Aug 2005, Deming Mi wrote: > Does anybody know if there is an R function (package) to fit a two-terms > exponential model like y = a*exp(bx) + c*exp(dx) where y is dependent > variable and x is independent variable. MATLAB has a Curve Fitting Toolbox > to implement this fitting, but I don't know if there is an R package for > this fitting. Thank you!
See ?nls >From my experience with such models the coefficients are often not well-determined and so you need a good starting point. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
