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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 Forum: Origin Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies Origin Ver.2016 (64bit)Sr2 - b9.3.2.303 Operating System:WINDOWS 10 PRO Dears, With reference to (95%) confidence band associated to non linear regression analysis (two parameters), I have some problems in understanding which formulation OriginLab use for calculating the "Estimated standard error of y". I attach as an image, the specific reference documentation. Incidentally, I tried to use the formulation for residual standard error SE=[Summatory(Y-Y')^2/(n-2]^0.5, but if I search to reproduce in Excel, by multiplying for [i]t.975[/i], I derive different envelops. On the contrary, I am observing that simply to use [mean (+-)SE/2] fits very well OriginLab (i.e.in some way extending the approach of Schneider (1999) for the characteristic value as [mean (+-)StandardDeviation/2)]. Thank you very much for your opinion! [img]https://my.originlab.com/ftp/forum_and_kbase/Images/Estimated%20standard%20error%20of%20y.png[/img]   Check here to subscribe to this topic.