I have some data and I realize a fit by myself but according to me the fit is not good at all... the problem is I would like to have a formula which tell me if the fit is good or not... I precise I fit data using Bessel functions. Thank you for your help !
2026-03-26 15:17:24.1774538244
How can I know my fit is good?
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You cannot determine if a fit is good or bad if you do not first express what means "good" and "bad" on mathematical form.
Thus, you have to chose a criterion of fitting which allows to compute a value which is a measurement of the goodness of fit between the set of observed values and the values expected under your model (That is the formula involving Bessel functions).
First, chose a standard test which underlying measure of fit appears convenient in your case. They are a lot :
https://en.wikipedia.org/wiki/Goodness_of_fit