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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Arthen2[/i] [br]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) [img]https://my.originlab.com/ftp/forum_and_kbase/Images/Reg1.gif[/img] Authors of publications says "[i]Linear regression was performed across both N and M and the resulting overall coefficient of determination (R2) was calculated[/i]" 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! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.