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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 MPM97[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2018(64bit) b9.5.0.193 Operating System: Windows 10 The main problem is that i dont understand how correctly to do an approximation and which parameters to use for determination how definitely function chosen fits data. For example, Residual Sum of Squares, R-Square (COD), Adj. R-Square are. How use it? I have read about them in Help Online, but i want to see a practical example. I did some approximations and i think that R-square is big for these results and i did something wrong. Maybe before I have to adjust some settings? Because i just choose default sigmoidal fit and make fitting. Just, i want to know when i have to use СOD and when others. Thanks in advance. [img]https://my.originlab.com/ftp/forum_and_kbase/Images/Снимок29.jpg[/img] [img]https://my.originlab.com/ftp/forum_and_kbase/Images/wefewf.jpg[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.