Range fit ROOT vs RooFit

ixiotidi · December 20, 2019, 3:56pm

Hi,

yes sure it’s a bit long sorry for that:

       Minimizer Type :          Minuit
  Minimizer Algorithm :          Migrad
             Strategy :               1
            Tolerance :               1
       Max func calls :            2000
       Max iterations :               0
       Func Precision :              -1
     Error definition :               1
          Print Level :               4

** 1 **SET PRINT 3

** 2 **SET NOGRAD

PARAMETER DEFINITIONS:
NO. NAME VALUE STEP SIZE LIMITS
1 aCheb -2.01640e-01 2.00000e+00 -1.00000e+01 1.00000e+01
2 aExpo -4.81840e-03 2.00000e+00 -1.00000e+01 1.00000e+01
3 nCheb 8.00000e+03 1.00000e+03 -1.00000e+04 1.00000e+04
4 nExpo 7.00000e+02 2.00000e+03 -1.00000e+04 1.00000e+04

** 3 **SET ERR 0.5

** 4 **SET PRINT 3

** 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
FCN=-6740.31 FROM MIGRAD STATUS=INITIATE 20 CALLS 21 TOTAL
EDM= unknown STRATEGY= 1 NO ERROR MATRIX
EXT PARAMETER CURRENT GUESS STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -2.01640e-01 2.00000e+00 2.01401e-01 2.44466e+02
2 aExpo -4.81840e-03 2.00000e+00 2.01358e-01 1.02488e+04
3 nCheb 8.00000e+03 1.00000e+03 1.72186e-01 1.50339e+03
4 nExpo 7.00000e+02 2.00000e+03 2.01881e-01 2.37796e+03
ERR DEF= 0.5
NO ERROR MATRIX
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
Warning in ROOT::Math::ROOT::Math::GausIntegrator: Failed to reach the desired tolerance ; maxtol = 1e-09
FCN=-6851.62 FROM MIGRAD STATUS=PROGRESS 43 CALLS 44 TOTAL
EDM=3651.13 STRATEGY= 1 NO ERROR MATRIX
EXT PARAMETER CURRENT GUESS STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -2.02094e-01 2.00000e+00 -4.54586e-05 3.67682e+02
2 aExpo -4.85522e-03 2.00000e+00 -3.68207e-06 1.10063e+04
3 nCheb 7.57946e+03 1.00000e+03 -6.71366e-02 1.34300e+03
4 nExpo 6.29685e+02 2.00000e+03 -7.04709e-03 1.89696e+03
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 60.9 per cent
FCN=-6948.81 FROM MIGRAD STATUS=PROGRESS 55 CALLS 56 TOTAL
EDM=820.09 STRATEGY= 1 NO ERROR MATRIX
EXT PARAMETER CURRENT GUESS STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -2.07580e-01 2.00000e+00 -5.48657e-04 -1.71993e+02
2 aExpo -5.01912e-03 2.00000e+00 -1.63901e-05 3.04062e+03
3 nCheb 7.00479e+03 1.00000e+03 -8.40903e-02 1.05981e+03
4 nExpo 6.60671e+02 2.00000e+03 3.10506e-03 1.44501e+03
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 40.5 per cent
FCN=-7033.36 FROM MIGRAD STATUS=PROGRESS 67 CALLS 68 TOTAL
EDM=29.0993 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 40.5 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -1.86440e-01 1.88470e-02 2.11444e-03 -4.20871e+02
2 aExpo -4.57258e-03 8.41509e-04 4.46543e-05 -3.16212e+03
3 nCheb 6.03136e+03 1.66372e+02 -1.28641e-01 2.85228e+02
4 nExpo 7.45241e+02 6.37146e+01 8.47805e-03 4.08272e+02
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 33.5 per cent
FCN=-7038.3 FROM MIGRAD STATUS=PROGRESS 77 CALLS 78 TOTAL
EDM=0.167868 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 33.5 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -1.68982e-01 1.88540e-02 1.74608e-03 -1.25880e+02
2 aExpo -4.21408e-03 8.41529e-04 3.58495e-05 3.55566e+03
3 nCheb 5.76449e+03 1.30457e+02 -3.30509e-02 -4.37622e+00
4 nExpo 7.61017e+02 6.29968e+01 1.58203e-03 -2.61768e+01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 20.5 per cent
FCN=-7038.38 FROM MIGRAD STATUS=PROGRESS 86 CALLS 87 TOTAL
EDM=0.0753875 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 20.5 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -1.64190e-01 1.88682e-02 4.79221e-04 -1.26255e+02
2 aExpo -4.46484e-03 8.23595e-04 -2.50753e-05 -2.35522e+03
3 nCheb 5.75413e+03 1.18067e+02 -1.26814e-03 -9.39475e+00
4 nExpo 7.69074e+02 6.30681e+01 8.08090e-04 -1.01617e+01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 11.6 per cent
FCN=-7038.42 FROM MIGRAD STATUS=PROGRESS 96 CALLS 97 TOTAL
EDM=0.0285916 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 11.6 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -1.57964e-01 2.21566e-02 6.22698e-04 1.62078e+01
2 aExpo -4.45334e-03 6.65287e-04 1.14949e-06 -7.44357e+02
3 nCheb 5.75579e+03 1.15614e+02 2.03423e-04 -4.58190e-01
4 nExpo 7.72019e+02 6.35080e+01 2.95369e-04 -3.14329e+01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 14.2 per cent
FCN=-7038.75 FROM MIGRAD STATUS=PROGRESS 111 CALLS 112 TOTAL
EDM=0.190544 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 14.2 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -1.26458e-01 2.67389e-02 3.15093e-03 1.01698e+02
2 aExpo -3.73604e-03 6.51763e-04 7.17302e-05 7.24793e+03
3 nCheb 5.57269e+03 1.04935e+02 -2.22182e-02 -1.38418e+01
4 nExpo 9.41982e+02 5.55878e+01 1.70593e-02 -7.03221e+01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 29.9 per cent
FCN=-7039.29 FROM MIGRAD STATUS=PROGRESS 125 CALLS 126 TOTAL
EDM=0.766387 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 29.9 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -3.10668e-02 6.24544e-02 9.53943e-03 1.40543e+02
2 aExpo -2.88332e-03 1.09777e-03 8.52715e-05 1.23335e+04
3 nCheb 5.04946e+03 3.48531e+02 -6.17743e-02 7.57353e+00
4 nExpo 1.48070e+03 3.13663e+02 5.42784e-02 -3.33576e+01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 27.0 per cent
FCN=-7039.34 FROM MIGRAD STATUS=PROGRESS 135 CALLS 136 TOTAL
EDM=0.0432306 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 27.0 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb -2.96437e-02 8.55350e-02 1.42305e-04 3.62811e+01
2 aExpo -2.96025e-03 8.92933e-04 -7.69231e-06 -1.04973e+03
3 nCheb 5.04130e+03 4.78794e+02 -9.45097e-04 2.66372e+00
4 nExpo 1.49012e+03 4.61635e+02 9.52313e-04 -5.90992e+00
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 13.6 per cent
FCN=-7039.41 FROM MIGRAD STATUS=PROGRESS 146 CALLS 147 TOTAL
EDM=0.0191361 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 13.6 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 6.91956e-04 8.55163e-02 3.03357e-03 3.98410e+01
2 aExpo -2.69089e-03 5.83699e-04 2.69353e-05 3.97001e+03
3 nCheb 4.83478e+03 4.84074e+02 -2.37510e-02 -9.02794e+00
4 nExpo 1.68708e+03 4.60109e+02 1.99502e-02 -2.30278e+01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 23.2 per cent
FCN=-7039.44 FROM MIGRAD STATUS=PROGRESS 157 CALLS 158 TOTAL
EDM=0.0537592 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 23.2 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 2.70878e-02 1.40169e-01 2.63958e-03 5.07280e+01
2 aExpo -2.50785e-03 1.04916e-03 1.83046e-05 9.17287e+03
3 nCheb 4.66885e+03 8.81203e+02 -1.88582e-02 6.02891e-01
4 nExpo 1.85913e+03 8.52872e+02 1.74819e-02 -1.65807e+01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 12.0 per cent
FCN=-7039.46 FROM MIGRAD STATUS=PROGRESS 167 CALLS 168 TOTAL
EDM=0.0119477 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 12.0 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 3.65156e-02 1.40073e-01 9.42784e-04 -1.38133e+01
2 aExpo -2.49009e-03 8.54622e-04 1.77598e-06 -1.33731e+03
3 nCheb 4.61266e+03 8.71096e+02 -6.34368e-03 3.19470e+00
4 nExpo 1.92093e+03 8.52988e+02 6.29333e-03 5.64454e+00
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 7.9 per cent
FCN=-7039.48 FROM MIGRAD STATUS=PROGRESS 179 CALLS 180 TOTAL
EDM=0.00354579 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 7.9 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 6.36034e-02 1.69795e-01 2.70882e-03 2.67554e+00
2 aExpo -2.34838e-03 9.05971e-04 1.41705e-05 3.10332e+03
3 nCheb 4.44285e+03 1.05857e+03 -1.90451e-02 -2.48903e+00
4 nExpo 2.08549e+03 1.04173e+03 1.67964e-02 -5.92630e+00
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 14.0 per cent
FCN=-7039.48 FROM MIGRAD STATUS=PROGRESS 190 CALLS 191 TOTAL
EDM=0.00772772 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 14.0 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 1.00049e-01 2.23007e-01 3.64469e-03 1.60486e-01
2 aExpo -2.21545e-03 1.10458e-03 1.32931e-05 3.17641e+03
3 nCheb 4.23339e+03 1.38256e+03 -2.32487e-02 -3.63150e+00
4 nExpo 2.29437e+03 1.33878e+03 2.14083e-02 -5.94885e+00
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 13.2 per cent
FCN=-7039.49 FROM MIGRAD STATUS=PROGRESS 200 CALLS 201 TOTAL
EDM=0.00157432 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 13.2 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 1.01964e-01 2.76830e-01 1.91502e-04 -1.60338e+01
2 aExpo -2.22410e-03 1.02458e-03 -8.64345e-07 -1.48779e+03
3 nCheb 4.22854e+03 1.57116e+03 -5.35425e-04 -2.99689e+00
4 nExpo 2.30098e+03 1.55948e+03 6.79619e-04 2.37415e-01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 7.2 per cent
FCN=-7039.49 FROM MIGRAD STATUS=PROGRESS 210 CALLS 211 TOTAL
EDM=0.000755703 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 7.2 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 1.16170e-01 2.76407e-01 1.42064e-03 -6.00234e+00
2 aExpo -2.18199e-03 9.35018e-04 4.21102e-06 2.68450e+02
3 nCheb 4.15704e+03 1.55494e+03 -7.87564e-03 2.63353e+00
4 nExpo 2.37592e+03 1.53961e+03 7.70753e-03 3.64706e+00
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 12.8 per cent
FCN=-7039.49 FROM MIGRAD STATUS=PROGRESS 220 CALLS 221 TOTAL
EDM=0.000310094 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 12.8 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 1.31879e-01 3.91247e-01 1.57103e-03 -3.90346e+00
2 aExpo -2.14154e-03 1.21150e-03 4.04417e-06 1.95570e+02
3 nCheb 4.07497e+03 2.09990e+03 -9.00493e-03 -1.07602e+00
4 nExpo 2.45529e+03 2.08722e+03 8.17918e-03 -5.15478e-01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 9.1 per cent
FCN=-7039.49 FROM MIGRAD STATUS=PROGRESS 230 CALLS 231 TOTAL
EDM=9.06832e-05 STRATEGY= 1 ERROR MATRIX UNCERTAINTY 9.1 per cent
EXT PARAMETER APPROXIMATE STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 1.31494e-01 4.28056e-01 -3.84397e-05 -5.10313e+00
2 aExpo -2.14973e-03 1.20669e-03 -8.19046e-07 -8.56299e+02
3 nCheb 4.08193e+03 2.21766e+03 7.61714e-04 -3.55815e-01
4 nExpo 2.44904e+03 2.20490e+03 -6.44791e-04 9.96384e-01
ERR DEF= 0.5
RELATIVE CHANGE IN COV. MATRIX= 5.6 per cent
MIGRAD MINIMIZATION HAS CONVERGED.
MIGRAD WILL VERIFY CONVERGENCE AND ERROR MATRIX.
START COVARIANCE MATRIX CALCULATION.
EIGENVALUES OF SECOND-DERIVATIVE MATRIX:
1.5465e-03 1.4375e-01 1.6637e+00 2.1910e+00
COVARIANCE MATRIX CALCULATED SUCCESSFULLY
FCN=-7039.49 FROM MIGRAD STATUS=CONVERGED 253 CALLS 254 TOTAL
EDM=0.000233441 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 aCheb 1.31494e-01 2.41114e-01 1.68238e-04 -5.10033e+00
2 aExpo -2.14973e-03 6.90185e-04 7.21676e-07 -8.61912e+02
3 nCheb 4.08193e+03 1.23198e+03 4.88705e-04 -3.53318e-01
4 nExpo 2.44904e+03 1.23247e+03 4.28315e-04 9.99043e-01
ERR DEF= 0.5
EXTERNAL ERROR MATRIX. NDIM= 25 NPAR= 4 ERR DEF=0.5
5.815e-02 1.397e-04 -2.895e+02 2.897e+02
1.397e-04 4.764e-07 -7.975e-01 7.980e-01
-2.895e+02 -7.975e-01 1.527e+06 -1.524e+06
2.897e+02 7.980e-01 -1.524e+06 1.527e+06
PARAMETER CORRELATION COEFFICIENTS
NO. GLOBAL 1 2 3 4
1 0.99275 1.000 0.839 -0.972 0.972
2 0.98340 0.839 1.000 -0.935 0.936
3 0.99805 -0.972 -0.935 1.000 -0.998
4 0.99832 0.972 0.936 -0.998 1.000
Info in TMinuitMinimizer::Minimize: Finished to run MIGRAD - status 0
EXTERNAL ERROR MATRIX. NDIM= 4 NPAR= 4 ERR DEF=0.5
5.815e-02 1.397e-04 -2.895e+02 2.897e+02
1.397e-04 4.764e-07 -7.975e-01 7.980e-01
-2.895e+02 -7.975e-01 1.527e+06 -1.524e+06
2.897e+02 7.980e-01 -1.524e+06 1.527e+06
FCN=-7039.49 FROM MIGRAD STATUS=CONVERGED 253 CALLS 254 TOTAL
EDM=0.000233441 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER PARABOLIC MINOS ERRORS
NO. NAME VALUE ERROR NEGATIVE POSITIVE
1 aCheb 1.31494e-01 2.41114e-01
2 aExpo -2.14973e-03 6.90185e-04
3 nCheb 4.08193e+03 1.23198e+03
4 nExpo 2.44904e+03 1.23247e+03
ERR DEF= 0.5

** 7 **SET ERR 0.5

** 8 **SET PRINT 3

** 9 **HESSE 2000

START COVARIANCE MATRIX CALCULATION.
EIGENVALUES OF SECOND-DERIVATIVE MATRIX:
5.4337e-04 1.4484e-01 1.6644e+00 2.1902e+00
COVARIANCE MATRIX CALCULATED SUCCESSFULLY
FCN=-7039.49 FROM HESSE STATUS=OK 23 CALLS 277 TOTAL
EDM=0.000233078 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER INTERNAL INTERNAL
NO. NAME VALUE ERROR STEP SIZE VALUE
1 aCheb 1.31494e-01 3.97287e-01 3.36477e-05 1.31498e-02
2 aExpo -2.14973e-03 1.12848e-03 1.44335e-07 -2.14973e-04
3 nCheb 4.08193e+03 2.06629e+03 9.77409e-05 4.20473e-01
4 nExpo 2.44904e+03 2.06857e+03 8.56630e-05 2.47421e-01
ERR DEF= 0.5
EXTERNAL ERROR MATRIX. NDIM= 25 NPAR= 4 ERR DEF=0.5
1.579e-01 4.220e-04 -8.198e+02 8.200e+02
4.220e-04 1.273e-06 -2.297e+00 2.297e+00
-8.198e+02 -2.297e+00 4.345e+06 -4.342e+06
8.200e+02 2.297e+00 -4.342e+06 4.346e+06
PARAMETER CORRELATION COEFFICIENTS
NO. GLOBAL 1 2 3 4
1 0.99734 1.000 0.941 -0.990 0.990
2 0.99382 0.941 1.000 -0.976 0.977
3 0.99932 -0.990 -0.976 1.000 -0.999
4 0.99941 0.990 0.977 -0.999 1.000
EXTERNAL ERROR MATRIX. NDIM= 4 NPAR= 4 ERR DEF=0.5
1.579e-01 4.220e-04 -8.198e+02 8.200e+02
4.220e-04 1.273e-06 -2.297e+00 2.297e+00
-8.198e+02 -2.297e+00 4.345e+06 -4.342e+06
8.200e+02 2.297e+00 -4.342e+06 4.346e+06
Fit status: 0

Minimizer is Minuit / Migrad
MinFCN = -7039.49
NDf = 6532
Edm = 0.000233078
NCalls = 277
aCheb = 0.131494 +/- 0.397287 (limited)
aExpo = -0.00214973 +/- 0.00112848 (limited)
nCheb = 4081.93 +/- 2066.29 (limited)
nExpo = 2449.04 +/- 2068.57 (limited)

Covariance Matrix:

        	       aCheb       aExpo       nCheb       nExpo

aCheb 0.15792 0.00042197 -819.77 820.02
aExpo 0.00042197 1.2735e-06 -2.2966 2.2973
nCheb -819.77 -2.2966 4.3445e+06 -4.3418e+06
nExpo 820.02 2.2973 -4.3418e+06 4.3455e+06

Correlation Matrix:

        	       aCheb       aExpo       nCheb       nExpo

aCheb 1 0.94096 -0.9897 0.98989
aExpo 0.94096 1 -0.97639 0.97657
nCheb -0.9897 -0.97639 1 -0.99925
nExpo 0.98989 0.97657 -0.99925 1

Cheers
–John

system · January 3, 2020, 3:56pm

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.

moneta · January 6, 2020, 9:34am

Hi

Thank you for posting the log file. I see in the log that you are having some error messages due to an error integrating the function. This is the thje reason of the difference. I am using the superior integrator from MathMore, which is the default if the Mathmore library is installed.
I would suggest to add MathMore in your installation, by re-configuring ROOT by doing for example

cmake . -Dmathmore=On -Dbuiltin_gsl=On

Lorenzo

moneta · January 7, 2020, 4:12pm

As a reference, see also this JIRA item related of fitting separated ranged in ROOT and RooFit.
https://sft.its.cern.ch/jira/browse/ROOT-8440

Non-extended fits in separated range will result in the normalization computed separatly for each region and then the relative amount of data in the two regions will not be used in the fit, and the result will be less accurate.

ixiotidi · January 10, 2020, 9:53am

Hi Lorenzo,

thank you for the two suggestions, so now I configured root in my machine with the two options on
and I am getting the same result as you get. So to summarize you think that the results are consistent
with each other and your only concern are the errors because of the large correlations of the parameters
right ? I am looking now into the jira ticket you have pointed me at.

Cheers
John