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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 pcave[/i] [br]Origin Version: 7.5 SR6 Operating System: Windows XP Pro When using the Fit Comparison tool with a simple Line model, Origin outputs the F-Test results as well as a t-Test result comparing the intercepts and slopes of the two linear fits. The algorithm behind this t-Test is not in the documentation; does anybody have any ideas as to how exactly this is performed? I assume it's some kind of hypothesis test, but I'm not sure exactly what the test statistic is or what data is used. NB-I admit that statistics is not my strong point, but I can usually follow things through. Thanks for your time! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.