Re: RooFit getError)= returns incorrect value

From: Rene Brun <Rene.Brun_at_cern.ch>
Date: Thu, 22 Jun 2006 15:19:14 +0200


I am forwarding your mail to the author

Rene Brun

Xianguo (Hsien-Kuo) LU wrote:
> Hi, rooters,
>
> After fitting with RooFit, I did:
> frac.Print();
>
> the result is
> RooRealVar::0xbab1c08::frac: 0.73801 +/- (-0.0472, 0.0466) L(0 - 1)
>
> Note that the error value is not unique. Is it common and
> determined by the fitting mechanism OR is it some
> error message caused by inappropriate initialization of the parameters?
>
> If it is the second case, how to avoid it?
> If it is the first case, how to get the error values? I did
> frac.getError()
> but it returned 0.
>
> Thanks in advance for any help!
>
> Cheers!
> Xianguo
>
>
> --
> Take flight into the sky, beyond the moon, beyond my mind.
>
> Xianguo LU
> Physics Department, Peking University
> Beijing, China
> Tel: 0086-10-62753888(o)
Received on Thu Jun 22 2006 - 15:19:29 MEST

This archive was generated by hypermail 2.2.0 : Mon Jan 01 2007 - 16:31:59 MET