[Rivet] Problem with yodamerge

[Andy Buckley]

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
>
>
>
>
>
>
>
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-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow