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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 Winkie_Bear[/i] [br]I'm using Origin to carry out non-linear fitting of an integral function; however, the fitted curve has segments that are offset alternately above and below the observed data, typically not by very much and apparently the segments are of random length. The offsets are real because the reported residuals match the segments. Clearly, the fit is not accurate. Can anyone advise why this might be occurring and how to fix it. I'm happy to send the file if necessary. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.