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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 jd0331[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Origin 8 Operating System: Win xp Hi, I performed NLfit and got R square and R value. I know that they represent the goodness of fitting. What I wonder is that I do not understand the differences between R square and R value. I checked Origin tutorial, and R value is the square root of R square, which means R square is equal to the R value. However, the final R square and R value results that I got after NLfit were different. Could you explain the differences to me if you know why please? By the way, I found that the reduced chi^2 is the chi^2 devided by Degree of freedom. What is Dof? Is it the number of data apoints? If so, why the Dof is different from that of my datapoints? Thanks. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.