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 What is wrong with my multiple linear Fit ?		  New Topic  Reply to Topic
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SimonW

Germany
4 Posts
Posted - 12/02/2021 :  07:25:40 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi guys I have a Problem, that I cant solve.

I'am fitting multiple lines in a scatter diagram. So far so good but there is one fit (the red one), with only two data points that goes wrong no matter what i try. I think it maybe is forced trough (0,0)...
Pls can some one help?

snowli

USA
1448 Posts
Posted - 12/02/2021 :  09:31:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
U can double check on 2nd tab of the fit dialog if Fixed intercept is checked.
Also what data is the red fit curve corresponds to? Is it possible that there are some red data points very low?

Thanks, Snow
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SimonW

Germany
4 Posts
Posted - 12/02/2021 :  09:52:11 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi, thnk's for the answer :)

I checked the fixed Intercept, it is off


Also the fit is for the values from the 5'th to the 6'th row therefor only two of them.
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snowli

USA
1448 Posts
Posted - 12/02/2021 :  09:58:49 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Do you mind share the project file so i can check?

Thanks, Snow
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SimonW

Germany
4 Posts
Posted - 12/02/2021 :  10:08:45 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Not at all, I deletet designations ect. because it is for my employer.

https://my.originlab.com/ftp/forum_and_kbase/Images/Project%20-%20Forum.opju
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YimingChen

1686 Posts
Posted - 12/02/2021 :  11:02:44 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Can you use Nonlinear Curve fitting tool instead? It should give correct result. We will look why it failed on linear fitting tool. See attached project file.
https://my.originlab.com/ftp/forum_and_kbase/Images/Project%20-%20Forum_YM.opju

James
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SimonW

Germany
4 Posts
Posted - 12/03/2021 :  01:59:07 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi, yes it works, thanks alot!
Because I need Pearson R, I used linear Fit and nonlinear Fit.
For everybody intrestet nonlinear Fit as Line works with Category > Polynomial and Function > Line
Thanks again for the quick Help and the great work!
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