Chi square test on a custom fitting function

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Ilaria Pintus
Ilaria Pintus 2019-5-16
Hello everyone!
I wrote a code in order to do a fit test with a custom function (code below)
%MODEL 1 Dose = a*netOD + b*(netOD)^3
x = netOD_average.'
y = dose
model1 = fittype({'x','x^3'})
fit_model1 = fit (x, y, model1,'Robust', 'Bisquare')
plot (fit_model1, 'black', x, y);
Now I'd like to make a chi square test to find the goodness of fit value. I've already search and try with the chi2gof function but I don't know what to use it.

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