Re: maximum likelihood fit

From: Rene Brun (Rene.Brun@cern.ch)
Date: Wed Aug 19 1998 - 09:33:34 MEST

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In reply to: Walerter Opaska: "maximum likelihood fit"
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Walerter Opaska wrote:
> 
> Hello
> 
> I was wondering if someone could explain to me the best way fit a curve in
> Root.  I have a 1D histrogram with a non-gaussian or non-exponential
> distribution ( actually a Breit-Wigner distribution) and need to do a
> maximun likelihood fit on the curve.  Could someone please give me a hint
> on the easiest way to fit this curve?
> 

You can find an example how to fit with a user-defined function
in the Root tutorial
   http://root.cern.ch/root/html/examples/myfit.C.html
Simply replace the expression in the function fitf by the
Breit-Wigner formula (a good candidate to be moved into the list
of standard functions!).

The option to use the "Maximum likelihood fit" is currently
not active in TH1::Fit.

Rene Brun

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