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Reduced chi-square goodness-of-fit statistic [message #65065] Sun, 08 February 2009 14:38
giorgosioannou84 is currently offline  giorgosioannou84
Messages: 2
Registered: February 2009
Junior Member
I got confused with the reduced chi-square goodness-of-fit statistic
returned by the curvefit. Can anyone tell me what exactly this is? I
had the impression that the fit is good when its value is near 1.
However when I try to test it with some good fits I get really small
values so I am not sure that what I thought is correct. For which
values to we reject the good-fit hypothesis?

In particular some of the data I have give me the following chi-
square goodness-of-fit statistics after fitting them to a curve:

chisq= 0.00018011358
chisq= 0.00013042104
chisq= 5.8597835e-005

Are these good fits?

And also what exactly is the unreduced chi-square goodness-of-fit
statistic returned by the poly_fit and when do we reject the good-fit
hypothesis there?

Thanks,
Giorgos

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