search for: nlsrob

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2008 Dec 22
0
nlsrob fails with puzzling error message on input accepted by nls
I have a nonlinear model estimation problem with ~50,000 data records and a simple 3 parameter model (logistic type - please don't tell me that there are linear methods for such a problem). I run nls with constraints once to get a good initial parameter guess, then try to run nlrob to get improved estimates. The model is well-behaved for the parameters that come from nls - no huge values, NAs
2008 Dec 29
0
Serial Correlation Test for Short Time Series
...Re: question about read datafile (jim holtman) 52. Re: Summary information by groups programming assitance (Ranney, Steven) 53. Problem in passing on an argument via ... how do I access it? (Mark Heckmann) 54. Simulate dataset using Parallel Latent CTT model in R (Nidhivkk) 55. nlsrob fails with puzzling error message on input accepted by nls (Oren Cheyette) 56. Re: Summary information by groups programming assitance (hadley wickham) 57. Re: Summary information by groups programming assitance (Gabor Grothendieck) 58. Re: Summary information by groups prog...