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Re: How to use BestFitParameters?

  • To: mathgroup at
  • Subject: [mg24398] Re: How to use BestFitParameters?
  • From: Lawrence Walker <lwalker701 at>
  • Date: Wed, 12 Jul 2000 23:13:41 -0400 (EDT)
  • Organization: Morgan State University: COMSARE
  • References: <8k0v83$>
  • Sender: owner-wri-mathgroup at

Hi Rob,

Use option "RegressionReport -> BestFit" instead.


rob wrote:

> p is a list of data pairs { {x1,y1}, {x2,y2}, ....} and when I fit
> this data to a function Mathematica does a pretty good job of doing the fit:
> NonlinearRegress[p, a/Sqrt[d^2 + (x1 - w0)^2], {x1}, {a, d, w0},
>   MaxIterations -> 200, RegressionReport -> BestFitParameters]
> gives this as an output:
> {BestFitParameters -> {a -> 1.07061, d -> 0.300272, w0 -> 28.8068}}
> I know it is pretty a pretty good fit to the data because I can use
> another program like Excel to plot the curve using these parameters
> and display it next to the data.  It sure would be nice to do this in
> Mathematica without going to an outside program.  I've tried things but I
> can't seem to be able to get to the parameters a, d and w0.  I can't
> even list them.  For example,  I'd like to display the number
> d/Sqrt[w0^2-d^2]. So I tried this:
> d/Sqrt[w0^2-d^2] /. %
> All I get is the formula in symbolic form.
> Can someone here provide some relief?
> Thanks, Rob


     (\___/)     The fear of the LORD is the beginning of
     (o\ /o)     wisdom: a good understanding have all they
    /|:.V.:|\    that do his commandments: his praise
    \\::::://    endureth for ever.              Psa 111:10
-----`"" ""`------------------------------------------------
        Lawrence A. Walker Jr., M.Eng./Ph.D. Candidate
                   Morgan State University
          Clarence M. Mitchell School of Engineering
 COMSARE (Center Of Microwave/Satellite And RF Engineering)
           Rm: 306-Schafer     Phone: (443)885-1453

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