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I got some comments in the terminal like , FitConfiguration and Minimizer result are not consistent, and i don’t know the impact of this comment regarding my fit. Furthermore, there is a warning “WARNING - - ABOVE PARAMETER IS AT LIMIT” and yeah i again dont know the impact of the warning. furthermore below is the complete comment in the terminal.
root [0]
Processing roofitsignal.cc…
RooFit v3.60 – Developed by Wouter Verkerke and David Kirkby
Copyright © 2000-2013 NIKHEF, University of California & Stanford University
All rights reserved, please read http://roofit.sourceforge.net/license.txt
[#1] INFO:DataHandling – RooDataHist::adjustBinning(datasig): fit range of variable x expanded to nearest bin boundaries: [0,20000] --> [40,20113.2]
Info in ROOT::Math::ParameterSettings>: lower/upper bounds outside current parameter value. The value will be set to (low+up)/2
[#1] INFO:Minization – RooMinimizer::optimizeConst: activating const optimization
Info in ROOT::Math::ParameterSettings>: lower/upper bounds outside current parameter value. The value will be set to (low+up)/2
** 1 **SET PRINT 1
** 2 **SET NOGRAD
PARAMETER DEFINITIONS:
NO. NAME VALUE STEP SIZE LIMITS
1 CB MEAN [GeV] 8.00000e+03 4.00000e+01 7.80000e+03 8.20000e+03
2 CB Sigma[GeV] 1.33000e+02 3.35000e+01 -2.00000e+02 2.00000e+02
3 alpha1 2.00000e+00 3.00000e-01 0.00000e+00 3.00000e+00
4 n1 2.50000e+00 constant
** 3 **SET ERR 0.5
** 4 **SET PRINT 1
** 5 **SET STR 1
NOW USING STRATEGY 1: TRY TO BALANCE SPEED AGAINST RELIABILITY
** 6 **MIGRAD 2000 1
FIRST CALL TO USER FUNCTION AT NEW START POINT, WITH IFLAG=4.
START MIGRAD MINIMIZATION. STRATEGY 1. CONVERGENCE WHEN EDM .LT. 1.00e-03
[#0] WARNING:Minization – RooMinimizerFcn: Minimized function has error status.
Returning maximum FCN so far (38560.1) to force MIGRAD to back out of this region. Error log follows
Parameter values: CB MEAN [GeV]=8000, CB Sigma[GeV]=129.654, alpha1=2, n1=2.5
RooCBShape::CBShape[ m=x m0=CB MEAN [GeV] sigma=CB Sigma[GeV] alpha=alpha1 n=n1 ]
getLogVal() top-level p.d.f evaluates to zero @ m=x=13072.6, m0=CB MEAN [GeV]=8000, sigma=CB Sigma[GeV]=129.654, alpha=alpha1=2, n=n1=2.5
FCN=36923.5 FROM MIGRAD STATUS=INITIATE 29 CALLS 30 TOTAL
EDM= unknown STRATEGY= 1 NO ERROR MATRIX
EXT PARAMETER CURRENT GUESS STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 CB MEAN [GeV] 8.00000e+03 4.00000e+01 0.00000e+00 5.42823e+01
2 CB Sigma[GeV] 1.33000e+02 3.35000e+01 0.00000e+00 -7.95386e+03
3 alpha1 7.31898e-01 3.00000e-01 -8.77427e-01 -8.49197e+02
4 n1 2.50000e+00 constant
ERR DEF= 0.5
MIGRAD MINIMIZATION HAS CONVERGED.
MIGRAD WILL VERIFY CONVERGENCE AND ERROR MATRIX.
COVARIANCE MATRIX CALCULATED SUCCESSFULLY
FCN=34938.9 FROM MIGRAD STATUS=CONVERGED 116 CALLS 117 TOTAL
EDM=5.57531e-08 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 CB MEAN [GeV] 7.92104e+03 3.13362e+00 2.19618e-03 8.40742e-03
2 CB Sigma[GeV] 2.00000e+02 3.20306e-02 2.31009e-03** at limit **
3 alpha1 1.37160e+00 2.27530e-02 1.96110e-03 1.26678e-02
4 n1 2.50000e+00 constant
ERR DEF= 0.5
EXTERNAL ERROR MATRIX. NDIM= 25 NPAR= 3 ERR DEF=0.5
9.820e+00 1.604e-09 -4.743e-03
1.604e-09 6.864e-12 -1.672e-11
-4.743e-03 -1.672e-11 5.177e-04
PARAMETER CORRELATION COEFFICIENTS
NO. GLOBAL 1 2 3
1 0.06652 1.000 0.000 -0.067
2 0.00033 0.000 1.000 -0.000
3 0.06652 -0.067 -0.000 1.000
Error in ROOT::Math::FitResult: FitConfiguration and Minimizer result are not consistent
Number of free parameters from FitConfig = 4
Number of free parameters from Minimizer = 3
** 7 **SET ERR 0.5
** 8 **SET PRINT 1
** 9 **HESSE 2000
COVARIANCE MATRIX CALCULATED SUCCESSFULLY
FCN=34938.9 FROM HESSE STATUS=OK 16 CALLS 133 TOTAL
EDM=5.5785e-08 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER INTERNAL INTERNAL
NO. NAME VALUE ERROR STEP SIZE VALUE
1 CB MEAN [GeV] 7.92104e+03 3.13360e+00 8.78472e-05 -4.05862e-01
2 CB Sigma[GeV] 2.00000e+02 3.20308e-02 4.62018e-04 1.57080e+00
WARNING - - ABOVE PARAMETER IS AT LIMIT.
3 alpha1 1.37160e+00 2.27530e-02 7.84442e-05 -8.57027e-02
4 n1 2.50000e+00 constant
ERR DEF= 0.5
EXTERNAL ERROR MATRIX. NDIM= 25 NPAR= 3 ERR DEF=0.5
9.820e+00 3.244e-10 -4.739e-03
3.244e-10 6.865e-12 -3.335e-12
-4.739e-03 -3.335e-12 5.177e-04
PARAMETER CORRELATION COEFFICIENTS
NO. GLOBAL 1 2 3
1 0.06647 1.000 0.000 -0.066
2 0.00007 0.000 1.000 -0.000
3 0.06647 -0.066 -0.000 1.000
[#1] INFO:Minization – RooMinimizer::optimizeConst: deactivating const optimization