How to get a "SUCCESSFUL" fit in MINOS and Accurate error matrix?

Roofit and RooStats
1

Dear All

I am fitting a line shape using TMinuit, MINOS, however, the results are always “STATUS=PROBLEMS” or “STATUS=FAILURE”.

I do not know how to optimize it.

And here is the code need to help:
help2.cxx (11.9 KB)
help1.cxx (14.1 KB)
bes3plotstyle.c (12.2 KB)
bes3plotstyle.h (5.9 KB)

2

Hi,

typically this kind of behaviours are linked to issues in the fit, for examples too many parameters, to few datapoints, too many local minima: it depends.
Perhaps you can help the procedure suggesting to the program meaningful initial values for the parameters?

Cheers,
D

3

Hi

Thanks for your advice! I have updated it.

Cheers

4

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