Re: [ROOT] confidence levels

From: Rene Brun (Rene.Brun@cern.ch)
Date: Tue Mar 23 2004 - 12:13:28 MET


Marco,

If you look at the example in $ROOTSYS/tutorials/fitcont.C, you will see
two TGraphs created. each TGraph containing the contour points for a degree
of confidence. These graphs are drawn. You can also see the points printed if
you do
  gr1->Print();
  gr2->Print();

Rene Brun

Marco Kienzle wrote:
> 
> Dear ROOT users,
> 
> following a previous message I send last year concerning plot of the 95%
> confidence interval of two estimates, I am wondering now if there is a
> way to retrieve the values of the boundaries of the confidence interval
> in order to output them in a text file: any suggestion ?
> 
> cheers,
> marco
> 
> Hi Marco,
> 
> marco kienzle wrote:
> >
> > Dear rooters,
> >
> > I am a new user of ROOT and didn't find answers to the following questions
> > in the RootTalkDigest:
> > - How do I get the variance-covariance matrix of the fit of a function to an
> > histogram (TH1F) when I use the method  Fit (hist->Fit("func");) ?
> 
>  double matrix[n][n];
>  use gMinuit->mnemat(matrix,n);
> 
> > - Is there a method to draw 95% confidence interval of the prediction of the
> > fitted function ?
> >
>  use gMinuit->mncont
>  see an example in $ROOTSYS/tutorials/fitcont.C
> 
> Rene Brun
> 
> > thanks in advance,
> > marco
> --
> ____________________________________________________________________________
> 
> Marco Kienzle
> Fisheries Research Services
> Marine Laboratory
> PO Box 101 Victoria Road
> Aberdeen AB119DB
> United Kingdom
> 
> direct: +44 (0) 1224 295421
> tel:    +44 (0) 1224 876544
> fax:    +44 (0) 1224 295511
> http://www.marlab.ac.uk
Marco,



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