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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 helporigin8[/i] [br]Hello, I tried to fit my set of data: -85 1.05263 0.30387 -75 1.35046 0.21091 -65 0.81008 0.13501 -55 0.88447 0.12766 -45 1.90095 0.17804 -35 3.59318 0.2339 -25 4.72954 0.25879 -15 4.15506 0.22435 -5 4.57592 0.3252 5 5.03697 0.34115 15 4.48785 0.22843 25 4.53401 0.25189 35 3.72175 0.23445 45 3.17097 0.22766 55 2.07167 0.19663 65 0.96694 0.14746 Using custom function: y=N*1/(x^2+102.55^2)^2)*((sin(x*Rc)/x)+(cos(x*Rc)/102.55)). My problem is that I cannot get the confidence band of fit using this function. Can you help me? Thank you, A. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.