Re: histogram subtraction and mean

An example:

http://www.slac.stanford.edu/~snyder/subHistMean.html

-Arthur S.

A.E. Snyder, Group ?                         \!c*p?/
SLAC Mail Stop #95                          ((.   .))
Box 4349                                        |
Stanford, Ca, USA, 94309                      '\|/`
e-mail:snyder_at_slac.stanford.edu                 o
phone:650-926-2701                              _
http://www.slac.stanford.edu/~snyder          BaBar
FAX:707-313-0250                          Collaboration
                                                 &
                                            Fermi/GLAST

On Tue, 1 Mar 2011, Arthur E. Snyder wrote:

> I've had trouble with mean of subtracted histogram calulated by root ..
> it's just plain wrong. Error very noticable when histogram is not
> near sysmetric, but people might be fooled when it is reasonably
> sysmetric. I just wrote my own mean calculatator based on bin content.
>
> Default should be fixed to do something reasonable.
>
> -Art S.
>
> A.E. Snyder, Group ? \!c*p?/
> SLAC Mail Stop #95 ((. .))
> Box 4349 |
> Stanford, Ca, USA, 94309 '\|/`
> e-mail:snyder_at_slac.stanford.edu o
> phone:650-926-2701 _
> http://www.slac.stanford.edu/~snyder BaBar
> FAX:707-313-0250 Collaboration
> &
> Fermi/GLAST
>
>
>
> On Tue, 1 Mar 2011, Stefan Piperov wrote:
>
>>
>> On Tue, 1 Mar 2011, Jan Friedrich wrote:
>>
>>>> me - but it would be interesting to hear to opinions of both user
>>>> community, and professional statistiticians on this subject.
>>>
>>> What is the latter supposed to be?
>>
>> I believe there's a problem with the current way ROOT calculates means
>> of histogrammed data, and a professional in the field can probably
>> confirm/reject that.
>> S.
>>
>> *---------------------------------------------------------------------*
>> Stefan Piperov Mail: FNAL P.O.Box 500, MS 205, Batavia, IL-60510
>> Phone: (630) 840-5176 E-Mail: piperov_at_fnal.gov
>> *---------------------------------------------------------------------*
>> "Give a skeptic an inch... and he'll measure it."
>>
>>
>
>
Received on Tue Mar 01 2011 - 21:05:42 CET