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 What is the fitting function of the fitting line?		  New Topic  Reply to Topic
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rainbowkoala

29 Posts
Posted - 09/24/2013 :  11:10:27 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
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

Sam Fang

293 Posts
Posted - 09/24/2013 :  11:43:06 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
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
OriginLab Technical Services
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rainbowkoala

29 Posts
Posted - 09/25/2013 :  02:37:06 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks Sam. I get it.
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