Re: [ROOT] TMultiGraph fit gives me a bad chi square.

From: Rene Brun (Rene.Brun@cern.ch)
Date: Mon Nov 17 2003 - 17:17:57 MET


Hi,

Your errors cannot be right. They are far too small. This makes the chisquare
too big.
Why do you multiply the errors by 0.001 ?

Rene Brun

Venkatesh Kaushik wrote:
> 
>  Hi ROOTers,
>  I have two sets of data points, which I am supposed to fit straights line
>  to. I try to fit both these with pol1, I observe two things
>  1) the chi square / dof value is horrible.
>  2) visually, i don't see the fit has done a good job.
> 
>  i am not sure what's happening. are there any default fit
>  strategies/parameters that is messing up my fit?
> 
> I have attached my code and the program output for your kind perusal.
> Thanks for the help.
> Venkat.
> 
>   --------------------------------------------------------------------------------
>                          Name: Eliveonly_ecal.gif
>    Eliveonly_ecal.gif    Type: GIF Image (IMAGE/gif)
>                      Encoding: BASE64
> 
>                   Name: Ecal_live.C
>    Ecal_live.C    Type: Plain Text (TEXT/PLAIN)
>               Encoding: BASE64



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