How to find the goodness of fit without using the curve fiting toolbox

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afrya 2013-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/109440-how-to-find-the-goodness-of-fit-without-using-the-curve-fiting-toolbox

评论： afrya 2013-12-12

Dear all , I would like to know if this is possible to calculate the goodness of fit measures R-square, adjusted R square, RMSE etc for an exponential fit without using curve fitting tool box.

When I do the exponential fit for my data , I get only the coefficient a and b exemple f =

     General model Exp1:
     f(x) = a*exp(b*x)
     Coefficients (with 95% confidence bounds):
       a =      0.4396  (0.3358, 0.5434)
       b =  -4.105e-05  (-0.001221, 0.001139)

Thanks in advance