Question about negative FCN values

Hi, I have a question about negative FCN values.

When fitting subsets of the same mass distribution with Roofit, I have noticed that in some mass ranges the FCN is negative and in other mass ranges the FCN is positive. Is there any reason to worry about negative FCN values?

Thank you

Hi @lonewolf219,
thanks for reaching out!
I think that @jonas could help with this.


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