Global Error for a Fitting Function

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Ella Kaplan
Ella Kaplan 2017-3-2
评论： Torsten 2017-3-2
I'm trying to find the global error between a data set and a fitting function. My fitting function is a pretty good fit but the error I'm getting using my script is really large. Any advice?
plot(xC,yC,'.');
hold on;
x=linspace(0,8,400);
m=2;
linfit(xC,yC,m);
y=11.7601.*x.^2-35.7861.*x+120.6944;
plot(x,y)
E=zeros(length(x),1);
for ii=1:400
E(ii)=(yC(ii)-y(ii)).^2;
end
err=sum(E);
disp(err)
  1 个评论
Torsten
Torsten 2017-3-2
The usual indicator whether your fit is good or bad is the coefficient of determination:
https://en.wikipedia.org/wiki/Coefficient_of_determination
Best wishes
Torsten.

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