Dear all, I implemented a non-linear model using nls(...) and it works just fine. I now tried to run the same model using nlrob(...) which basically does the same but uses a more robust estimation procedure. My problem: I cannot seem to get nlrob(...) running. Irrespective of how I try to call the function, I always get the error message "Error in is.null(x) : 'x' is missing". I do not use the variable "x" at all so this must be some kind of different problem. Can anyone help me out here? Many thanks Timo Karlsruhe Institute of Technology ___________________________________________________________ Schon gehört? WEB.DE hat einen genialen Phishing-Filter in die
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.