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Tumadre2
Italy
1 Posts |
 Posted - 09/23/2016 : 10:16:11 AM
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| Hello everyone. I'm kind of new to the program, and I need help about a question. I have two 27x1 arrays of data, and I did linear fitting of them through Analysis>Fitting>Linear Fit. Now, the result is the images you'll find in the zipped file. I can't understand why in the first image it says that the intercept value is 99.26494 while in the second image,that one of the scatter, it's possible to observe a clear intercept at almost 40. Could somebody help me, explaing why does this happen? Thanks to everyone!http://www.originlab.com/ftp/forum_and_kbase/Images/Fit_Images.zip |
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Hideo Fujii
USA
1582 Posts |
Posted - 09/23/2016 : 3:26:41 PM
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Hi Tumadre2,
The intercept is in definition the Y value at X=0 in the linear regression. If you want to visualize this,
in the Linear Fit tool, you can set the Range to "Custom", and set Min value to 0 under "X Data Type"
option branch under the "Fitted Curves Plot" tab.
--Hideo Fujii
OriginLab
P.S. Your result r=-0.28 indicates that the correlation is weak; especially in your case, X=0 is
quite out of your data range. Turn ON the "Confidence Bands" check box, then you will see
how unreliable your intercept value 99.26... is. |
Edited by - Hideo Fujii on 09/23/2016 4:09:46 PM |
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Linear Fitting Error