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
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