MathGroup Archive 2004

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  • Subject: [mg49915] NonlinearRegress
  • From: "Chris O'Brien" <obrien at>
  • Date: Fri, 6 Aug 2004 03:09:31 -0400 (EDT)
  • Organization: University of Queensland
  • Sender: owner-wri-mathgroup at

I've been using the NonlinearRegress function to extract parameter values
from experimental data, with mixed success. While normally the extraction
works well, it seem to fail spectacularly when it does - extracting values
several orders of magnitude outside the specified range.

Is there any way to guarantee that the extracted parameters fall within the
range given for them, even if those parameters do not represent the best
global fit ?

I have been using the following options -

NonlinearRegress[<data>, <expected function>,  <variables>, {{<param1>,<
startvalue>,< min>, <max>}. {<param2>, ....}}, MaxIterations->100000,
Method->Automatic, RegressionReport-> BestFitParameters]

to extract 3-4 parameters from ~350 data points.

Thanks for your help,

Christopher O'Brien
University of Queensland

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