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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 Thank you very much Nadeesha In effect until now I used direct equations, without using matrix formulation.I will try as you suggest... Anyway, what is still not clear to me is if the formulation I remarked for the residual should give a reasonable result while using Excel, or other similar equation could be employed, in eventual alternative to matrix. I profit to attach the comparison Origin/Excel graph by using for 95% confidence. Note that I forced the passage through the origin axis, as required for the specific case. As i said, I used for 95% the value of SE/2.. Again thank you! Giordan [img]https://my.originlab.com/ftp/forum_and_kbase/Images/Origin_Excel%20comparison.JPG[/img]   Check here to subscribe to this topic.