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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 Deutscheman[/i] [br]I fit using non linear curve fit. When I use weighting method one problem appears, because I have not only y-error but also x-errors, so I should take into account both for correct weighting of chi-square. But I did not find it possibility. Real function of weighted chi square in this case Chi^2=Sum[(y(i)-F(x(i)))/(erry(i)^2-{F(x(i)+errx(i))-F(x(i)-errx(i))/2}^2)] So, maybee i can change calculation of chi-square on this formula? But, maybe Origin can do it correctly, then write me, please, how? Edited by - Deutscheman on 10/13/2006 11:41:06 AM [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.