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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 gdroogmans[/i] [br]I get the follwoing error message, when fitting my data with a user-defined function: "There is(are) zero or small y value(s) and this is not consistent with the chosen weighting method". This occurred with statistical weighting, instrumental or using anarbitrary data set. The fitting procedure worked OK if I use no weighting. So probably it is not a problem of the fit function. Any advise to prevent this error is welcome. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.