Information of Fit("gaus") code

Roofit and RooStats
1

When i running the code Fit(“gaus”), there a created information for 'Gaussian Fit" in terminal.
Result(What i want) is sigma value but created info has lot of contents. i`m confused.
So, I want to learn what is the other content mean.
Thank you.

This is the content as i said.

FCN=5705.02 FROM MIGRAD    STATUS=CONVERGED          73 CALLS           74 TOTAL
               EDM=7.4016e-10       STRATEGY = 1         ERROR MATRIX ACCURATE
EXT PARAMETER                                            STEP               FIRST
NO. NAME           VALUE            ERROR           SIZE            DERIVATION
1.    Constant      
2.    Mean
3.    Sigma
2

Hi,

Mean is the value of the “mean” parameter of the gaussian, it tells you where the distribution is “centred”.

Cheers,
D

3

HI,

Thank`s your reply.
and then, What is other word? for example, FCN, EDM, CALLS etc…
if you know that, please teach me. haha

best regard,
Z

4
  • FCN is the value at the minimum of the least-square or likelihood function
  • EDM is the expected distance from the minimum, used to control and stop the minimisation iterative procedure. When smaller than a given value (typically around 10^-4) the minimisation procedure stops.
  • CALLS is the number of function calls used to perform the minimisation

Best,

Lorenzo

5

Thank you so much Lorenzo.

your reply is really helpful.
thank you for your reply

best regard,
Z