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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 Forum: Origin Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies OriginPro 2022 (64-bit) SR1 on Win10 -I've just recently tried out the ODR fitting method in OriginPro, and am trying to understand the values of the fitting results. I made up a simple dataset of x, xerr, y, yerr values and fit it to a straight line equation in the NLSF, as well as using the 'Linear Fit with X error' option. Both routines produced the same fit results (parameters, parameter unc., RSS, etc.). However, when I try to make sense of the RSS value and the residual values, I cannot figure out how those values are being determined. Here is the NLSF fit results: [img]https://my.originlab.com/ftp/forum_and_kbase/Images/NLSF%20ODR%20fit%20results%201.jpg[/img] When I look at the curve tab, I see: [img]https://my.originlab.com/ftp/forum_and_kbase/Images/NLSF%20ODR%20fit%20results.jpg[/img] Question 1): How are the "Residual of Sheet1..." values calculated? I cannot find a reference that explains these, and cannot figure them out based on the actual data values (columns C,E) and the values of the fit (columns A and B). For example, the very first row indicates that the 'y' residual should be: 2-0.04577 = 1.95423, yet column F has something completely different. Question 2): The online information indicates that the RSS value is calculated the same as usual (for LM fits), but I cannot reproduce the value being reported by the ODR fit. I think this must be related to the first question. Thank you for any help that anyone can provide. Lowell   Check here to subscribe to this topic.