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chisq value [message #85872]

Sun, 15 September 2013 22:11

gunvicsin11
Messages: 93
Registered: November 2012

Member

Hello everyone,
I am trying to understand what is the chisq keyword means in the routine,
poly_fit,
svdfit
linfit

So I took a simple example, x=[1,2,3,4],y=[1,2,3,4]
when I give
p=poly_fit(x,y,1,chisq=c)
c= 1.14631e-30
p=svdfit(x,y,2,chisq=c)
c= 2.86139e-13
p=linfit(x,y,chisqr=c)
c=0.00000

for poly_fit and linfit the definition of chisq is the same
"Set this keyword to a named variable that will contain the value of the unreduced chi-square goodness-of-fit statistic"

But the chisq values are different in both these cases even though the inputvalues given are same.

Could anyone please let me know what this chisq fit actually means.

Thanking you in advance,
sid

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[Message index]

		chisq value By: gunvicsin11 on Sun, 15 September 2013 22:11
		Re: chisq value By: Mats Löfdahl on Sun, 15 September 2013 23:16
		Re: chisq value By: Mats Löfdahl on Sun, 15 September 2013 23:23
		Re: chisq value By: Craig Markwardt on Tue, 17 September 2013 09:31

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