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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 busyphd[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8.5.1 SR2 Operating System: Windows XP Hello, When performing nonlinear fitting I would like to weight my responses by the squared inverse of the fitted curve. Does the weighting option "Variance ~ y^2" accomplish this? I want to be sure I am using the estimated curve and not the actual data points. If this function does not how can I do this? Thanks! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.