[Rivet] CDF_2008_S778... --- YODA Profile1D low stats error

[Holger Schulz]

Whoops, never mind, bin.effNumEntries() does that.

This is my work around for this analysis:


         double y  = 0;
         double ey = 0;
         if (ph_i->bin(1).effNumEntries() > 1) {
           y = 1.0 - ph_i->bin(1).mean();
           ey= ph_i->bin(1).stdErr();
         }


Not sure though, what values to set y and ey to in case of low stats.

Holger




On 23/07/16 18:42, Holger Schulz wrote:
>
> Hi,
>
> the CDF_2008 b-jet shapes analysis (unvalidated) requires some
> protection for YODA::Profile*Bin*1D.stdErr() because of this:
>
>     terminate called after throwing an instance of 'YODA::LowStatsError'
>       what():  Requested variance of a distribution with only one
>     effective entry
>
> I don't see a function that tells me the number of effective entries 
> for Profile*Bin*1D.
>
> Any thoughts on how to deal with that?
>
> One would either need a protection on analysis level or change
> the behaviour of stdErr such that it doesn't throw an exception.
>
>
> Holger
>
>
>
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