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 Weighted linear regression (1/x, 1,x^2, etc)		  New Topic  Reply to Topic
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nesgio

Switzerland
6 Posts
Posted - 10/25/2023 :  08:59:17 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
OriginPro 2022 Service Release 9.9.0.225
Operating System: Windows 10 Enterprise Build 19045

Hello,

Do you know how to perform a weighted linear regression such as 1/x, 1/x^2, 1/y,... on OriginPro 2022? I didn't found the option while creating a new graph.

Thank you!

Gio

YimingChen

1613 Posts
Posted - 10/25/2023 :  09:24:58 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Please refer to this page for different weight options in curve fitting.Thanks.
https://www.originlab.com/doc/en/Origin-Help/FIt-with-Err-Weight

James
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nesgio

Switzerland
6 Posts
Posted - 10/25/2023 :  10:46:40 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi James,

Thank you for your answer. Should I set a specific column like the image below to perform the direct weighting?


When I perform the linear regression there is no option to set the X error (and then change it as weighting). See picture below


Best,

Gio
Edited by - nesgio on 10/25/2023 10:47:44 AM
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YimingChen

1613 Posts
Posted - 10/25/2023 :  11:32:30 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Please check this FAQ page on fitting with X errors
https://www.originlab.com/doc/Quick-Help/NLFit-X-Err
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nesgio

Switzerland
6 Posts
Posted - 10/26/2023 :  04:13:43 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks for the reply. I follow it but it doesn't work (see picture below)



I set a column with values "1/x". Should I do something different?

I also tried the "Speedy Fit" feature but still the weighting option is not available (see below).



Gio
Edited by - nesgio on 10/26/2023 04:17:18 AM
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YimingChen

1613 Posts
Posted - 10/26/2023 :  08:57:53 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Please watch the attached video showing the steps to perform linear fit on the dataset using 1/x value as the weights.

https://my.originlab.com/ftp/forum_and_kbase/Images/LinearFitXErr.zip
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