[Rivet] Problem with yodamerge

[Hannes Jung]

Hi Andy, Chris

thanks  a lot for your reply.
Yes, I am trying to merge normalised Histograms.
ahh, and yes, I have some strange Scaledby values: 5.1279402177630292e+97
I guess this is what causes the problem.
Where are those set, is this an issue of statistics ?

The cpmmand I use is 

yodamerge --assume-normalized yoda-files

Thanks again
Cheers
Hannes



> On 13.10.2015, at 11:23, Andy Buckley <andy.buckley at cern.ch> wrote:
> 
> Hi Hannes,
> 
> What sort of data object are you merging here? From the y-axis it looks like a normalized histogram rather than {unnormalized histo, profile, ratio}.
> 
> If that's right, yodamerge will look for the ScaledBy attribute of that plot to reverse the normalisation, add all the unnormalised histos together, then rescale by the weighted mean ScaledBy. It *shouldn't* be sensitive to one run having much smaller stats than the others, certainly not in a way that would show up like this.
> 
> If you can provide a bit more detail of what this object is, and how you're trying to merge the runs, we can try to help. You can also plot or take a look inside the .yoda files to see if the individual runs look sane, i.e. have reasonable fill counts and ScaledBy values.
> 
> Andy
> 
> 
> On 13/10/15 08:22, Hannes Jung wrote:
>> Dear Rivet experts
>> 
>> I am using yodamerge to merge several yoda files (actually it is 1000 or
>> so),
>> to get reasonable statistics in a reasonable computing time.
>> Sometimes I obtain strange results, like in the plot below,
>> where the normalization is completely off.
>> I am using Rivet 2.4.0, but a similar problem I had with Rivet 2.2.0.
>> 
>> Any idea what this could be ?
>> 
>> Since I am merging 1000 yoda files, it's hard to tell whether it comes
>> from one
>> specific file.... however, all jobs finished without error...
>> 
>> Thanks a lot
>> Cheers
>> Hannes
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> ***********************************************************************
>> Hannes Jung
>> Email: Hannes.Jung at desy.de <mailto:Hannes.Jung at desy.de> <mailto:Hannes.Jung at desy.de <mailto:Hannes.Jung at desy.de>>
>> mobile :+49 40 8998 93741
>> http://www.desy.de/~jung <http://www.desy.de/~jung>
>> Tel: +49 (0) 40 8998 3741
>> Fax: +49 (0) 40 8994 3741
>> DESY, CMS 01B/02.213
>> Notkestr.85, 22603 Hamburg, FRG
>> ***********************************************************************
>> 
>> 
>> 
>> 
>> 
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> 
> 
> -- 
> Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
> Particle Physics Expt Group, University of Glasgow

***********************************************************************
Hannes Jung 
Email: Hannes.Jung at desy.de 
mobile :+49 40 8998 93741
http://www.desy.de/~jung                                  
Tel: +49 (0) 40 8998 3741         
Fax: +49 (0) 40 8994 3741
DESY, CMS 01B/02.213
Notkestr.85, 22603 Hamburg, FRG   
***********************************************************************



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