[Rivet] Merging of nparton samples

[Alexander Grohsjean]

Hi Andy,

will this properly merge histograms with fractions (like the ttbar jet 
veto analysis ) taking the number of events in
each histogram into account? Otherwise it would just work for the 
special case where you fill each histogram
with the same number of events, no?

Cheers, Alexander.



Am 13.11.2014 um 14:03 schrieb Dominic Hirschbuehl:
> Hi Andy,
>
> great, this seems to be what I was looking for. I'll try it out and let
> you know.
>
> Thanks
>    Dominic
>
> On Thu, Nov 13, 2014 at 01:00:10PM +0000, Andy Buckley wrote:
>> Quick comment, since I'm teaching: you can give weights to each file for
>> merging on the yodamerge command line. Does that solve your problem, if
>> you use the xsecs, or something proportional to them, as the merging
>> weights?
>>
>> Andy
>>
>>
>> On 13/11/14 12:56, Chris Pollard wrote:
>>> Hi Dominic,
>>>
>>>      Yes and no. I need to weight the different histograms during the
>>>      merging.
>>>      What I have are for example 5 samples:
>>>      tt+0p   9.97 pb
>>>      tt+1p  10.83 pb
>>>      tt+2p   7.72 pb
>>>      tt+3p   3.95 pb
>>>      tt+4+p  2.58 pb
>>>      Now these 5 subsampels need to be merged to one common sample, with
>>>      their given xs.
>>>
>>>
>>> Right, but if you normalize each histogram to the appropriate xs in
>>> finalize(), this shouldn't be a problem. Is this not what you're doing?
>>>
>>> Chris
>>>
>>>
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>>
>> -- 
>> Dr Andy Buckley, Royal Society University Research Fellow
>> Particle Physics Expt Group, University of Glasgow / PH Dept, CERN