I have a question concerning the fit statistics. When you print the fit statistics, there is one that is “Prob”…what does that mean? Is that the probability that the function ( gaus, expo, landau, etc… ) fits the histogram?
Sorry if this is a bad question.
“Prob” is the p-value of the chi2 goodness of fit test. It corresponds to the probability to obtain chi2 values larger than the one obtained in the fit.
Lower p-value will indicate a less likely fit results. The test hypothesis is that the function is in agreement with the data, and it can be rejected when the p-value is smaller to some significance level (for example few %).
You can find more information in any statistics books or even on the wikipedia under the chi2 goodness of fit test
Thank you very much for your help.