`diffsig` option in TRatioPlot class

Newbie
1

Hi,

I don’t think I understand the diffsig option in the TRatioPlot class, and I was hoping for some clarification:

Say that I’m using the constructor new TRatioPlot(hist1, hist2, "diffsig"). If I understand it correctly (tried it out too), it would mean that the function would substract the bins in hist1 from hist2 (i.e.: hist2[i]-hist1[i]). However, I don’t understand how the uncertainties are calculated, and how the bins are divided by the uncertainties. And as I have histograms, does that mean that my uncertainties are simply the square root of the number of counts in the bin?

Thanks in advance for any help in explaining this!

2

All available information about this option is given in the reference guide.
I guess that’s what you looked at.
The code implementing this option is at line 933 in the source code.

3

Thanks @couet , I had a better look into the source code and I think I now better understand it.

4

If you think the documentation needs some clarification please let us know.