[R] nlrob(...) returns error message

[Timo Schlaefer]

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
 
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