Hello everybody,
I would like to ask a newbee question about the sense of computing the error of each bin of a given histogram with the TH1::Sumw2() method.
Why do we calculate the uncertainty on the value of each bin using the sum of squares of weights, is it because we consider that the error follow a gaussian law ?
Sorry for this naive question but I haven’t found any answer on that point yet and I would like to understand what I am doing with the errors associated to an histogram.
To precise my question, I would like to calculate the statistical uncertainty associated to a MC sample in my analysis.
Cheers,
Jerome