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 What is the fitting function of the fitting line?

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rainbowkoala Posted - 09/24/2013 : 11:10:27 PM
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8.5.0 SR1
Operating System: win7

When using "Apparent Fit", I can get a red fitting line as shown in the insert image. The fitting result also include the fitting function, however, the red line doesn't fit the function. What is the fitting function of the fitting red line?

The original data in the attachment.
Thanks for your help.



http://www.originlab.com/ftp/forum_and_kbase/Images/fitting function.ogw
2   L A T E S T    R E P L I E S    (Newest First)
rainbowkoala Posted - 09/25/2013 : 02:37:06 AM
Thanks Sam. I get it.
Sam Fang Posted - 09/24/2013 : 11:43:06 PM
If both of your x and y are log10 scale in the graph for Apparent Fit, then your fitting function will be:

log(y)=Intercept+B1*log(x)+B2*log(x)^2+B3*log(x)^3


i.e.

y=10^Intercept*x^B1*x^(B2*log(x))*x^(B3*log(x)^2)


Sam
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