Minization --RooFitGlue: Minimized function has error status

Roofit and RooStats
1

Hi,

I am a beginner in roofit and I am fitting a resonance using RooAddPdf (Gaussian and Polynomial) for the signal & background. However, while running the code, I get the following error:

[#0] WARNING:Minization – RooFitGlue: Minimized function has error status.
Returning maximum FCN so far (14367.8) to force MIGRAD to back out of this region. Error log follows
Parameter values: b=-0.000506632, fsig=0.5, mean=1865, sigma=20
RooAddPdf::model[ fsig * sig + [%] * bkg ] has 114 errors
RooPolynomial::bkg[ x=d0Mass coefList=(b) ] has 57 errors

I cannot really conclude to what could be causing it. Any hint??

thanks in advance,
eleni

2

I don’t know if it’s your problem but I suggest you check if the total PDF you get is positive defined with the parameters you are obtaining. Except that I have no idea…

– Gregory

3

Hi,

I realized that I had to play with the parameters of the pdf. Choosing better ones make this warning disappear.

thanks
cheers
eleni

4

How did you adjust the parameters of the PDF? I’m getting the same error and would love to know. It might help me (on this thread: Two-fraction binned fit with RooFit not working)