Question about negative FCN values

Roofit and RooStats
1

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

2

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

Cheers,
Monica

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