Dear ROOT experts,
I’ve seen in section 7.7.4 of Chapter: FittingHistograms that I can set the confidence level of the parameter errors using MinimizerOptions::SetErrorDef(errordef)
. For a chi-square fit, I know I should use errordef=n^2
for a confidence level of n
sigma. However, for a log-likelihood fit (which is my case), I can only find in the documentation that errordef=0.5
corresponds to 1 sigma. I’d like to know what value of errordef
corresponds to 2 sigma in this case.
Thank you in advance,
Lucas