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 R2 and bilinerar regression		  New Topic  Reply to Topic
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Arthen2

2 Posts
Posted - 07/16/2020 :  4:30:17 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello all!

I've been using Origin for years, but now can't solve it.

Lets have a function and take first 20th points.
Lets divide that 20 points: first 8th (name it "N") and next 12 (name it "M"). Its easy :-)
Next, do linear regression of points 1..8 (magenta line) and points 9..20 (green line)
Last: calculate coefficient of determination (R2)


Authors of publications says "Linear regression was performed across both N and M and the resulting overall coefficient of determination (R2) was calculated"

Looks easy, bum I'm stopped. It is possible in MATLAB, but I'd like to calculate it using Origin :-)

Any clues? Thanks in advance!
Edited by - Arthen2 on 07/16/2020 4:49:08 PM

AmandaLu

439 Posts
Posted - 07/17/2020 :  02:44:23 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

You can fit two sections with a piecewise function in which functions of 1st and 2nd segments are linear (a*x+b). The R-Square value is what you need.

https://www.originlab.com/fileExchange/details.aspx?fid=325

Thanks,
Amanda
OriginLab Technical Service
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Arthen2

2 Posts
Posted - 07/17/2020 :  1:54:51 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you very much. It works :-)
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