Hi !
I am having some problems of POLE software. This POLE is from the github and the developer is from CERN, so I want to ask some helps in root forum.
This POLE used to calculate upper limit by using Feldmancousins methods including systematic error, thus I download the POLE and try to run some example:
however the output is below, it seems wrong but I can’t know how to solve this problem:
*Test hyp. step : 0.01

Step mu_best : 0.01
Max N, mu_best : 20

Method : FHC2

Verbosity : 0

Parameters prefixed with a * above are not
relevant for limit calculations.
==============================================

 ERROR: limit calculation failed. Possible causes:
 1. binary search threshold too large
 2. precision threshold too large
 3. precision in integrations (eff,bkg) not sufficient
 4. poisson table insufficient precision > try without tabulated poisson
 5. minimum probability in belt calculation too large; min = 0.001

 Results:
 probability (should be ~ CL) = 0.890523
 lower lim norm (should be ~1) = 1
 upper lim norm (ditto) = 0.89976
 lower lim = 0
 upper lim = 2.29625

So is there someone is familiar with this POLE software or someone who knows the developer of POLE: Fredrik Tegenfeldt ? I want to contact with the developer and fix the problem as soon as possible. Thanks !
I see the repo now, Sorry I missed it in the title.
As @bellenot said this guy is not visible in the CERN directory.
Maybe he was 17 years ago when the software was created.
I think the best is to post an issue on the GitHub repository.
If one reduces the bkgmeas to 0.9 then that error comes and also similar by increasing the bkgsigma…
It seems to be a bug, try varying the values slightly then for such small values the UL won’t change drastically. You can follow the the paper: Phys.Rev.D57:38733889,1998 for comparing the UL values…
Yes. POLE can work well just in some values. However it seems nobody maintain POLE program now thus I decided use RooStat to calculate upperLimit. Thank you