gnuplot_tut/fit.log at main · Hubery-Lee/gnuplot_tut · GitHub

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*******************************************************************************
Sun Oct 16 20:22:13 2022


FIT:    data read from "ExpdataError.txt" us 1:2
        format = x:z
        #datapoints = 20
        residuals are weighted equally (unit weight)

function used for fitting: f(x)
	f(x)=a*exp(-b*x)
fitted parameters initialized with current variable values

iter      chisq       delta/lim  lambda   a             b
   0 9.6106450103e+00   0.00e+00  1.87e-01    1.000000e+00   1.000000e+00
   7 2.5721145569e-02  -2.94e-03  1.87e+00    2.049217e+00   1.711930e-01

After 7 iterations the fit converged.
final sum of squares of residuals : 0.0257211
rel. change during last iteration : -2.93575e-08

degrees of freedom    (FIT_NDF)                        : 18
rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 0.0378015
variance of residuals (reduced chisquare) = WSSR/ndf   : 0.00142895

Final set of parameters            Asymptotic Standard Error
=======================            ==========================
a               = 2.04922          +/- 0.02683      (1.309%)
b               = 0.171193         +/- 0.003512     (2.051%)

correlation matrix of the fit parameters:
                a      b
a               1.000
b               0.651  1.000


*******************************************************************************
Sun Oct 16 20:26:40 2022


FIT:    data read from "ExpdataError.txt" us 1:2:3 yerrors
        format = x:z:s
        #datapoints = 20
function used for fitting: f(x)
	f(x)=a*exp(-b*x)
fitted parameters initialized with current variable values

iter      chisq       delta/lim  lambda   a             b
   0 2.5734435745e+00   0.00e+00  7.14e+00    2.049217e+00   1.711930e-01
   1 2.5734435581e+00  -6.36e-04  7.14e+00    2.049220e+00   1.711933e-01

After 1 iterations the fit converged.
final sum of squares of residuals : 2.57344
rel. change during last iteration : -6.36433e-09

degrees of freedom    (FIT_NDF)                        : 18
rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 0.378113
variance of residuals (reduced chisquare) = WSSR/ndf   : 0.142969
p-value of the Chisq distribution (FIT_P)              : 0.999992

Final set of parameters            Asymptotic Standard Error
=======================            ==========================
a               = 2.04922          +/- 0.02683      (1.309%)
b               = 0.171193         +/- 0.003512     (2.051%)

correlation matrix of the fit parameters:
                a      b
a               1.000
b               0.651  1.000