I changed the norm-function of FindFit according to this answer, because apparently it is not supported for NonlinearModelFit that has inbuilt statistic analysis (see also this question).

Now, is there a way to easily obtain statistics on the fit of FindFit, like standard error, rsquared, adj rsquared? Are there predefined commands that could do this?

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    $\begingroup$ Check VarianceEstimatorFunction option of NonLinearModelFit. FindFit probably doesn't have any inbuilt statistics yielding method $\endgroup$ – Subho Apr 27 '18 at 8:55

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