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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 sharapova[/i] [br]Hi there, I have experimental data that seem to give a sigmoidal like shape. My supervisor told me to fit an error function (but he didn't specifiy further). Wikipedia gives me the following: http://en.wikipedia.org/wiki/Error_function So I have 2 problems: 1. I need to introduce fitting parameters to account for x/y shift and the curvature...I am a bit confused about the integral, but I was thinking to adjust the gaussian function inside of it, so I would substitute exp(-x2) by A + exp(-k(x2-x0)) but maybe this is wrong and there is an easier way to do this ? Anyways, 2. How can I implement this in Origin ? I would prefer to avoid coding since I only started using this software. I don't quite see how to insert a formula containing an integral, the more so as I am wondering whether Origin is capable of doing such a fit.. I am looking forward to your answers Cheers [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.