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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 LCG[/i] [br]Hello, I was trying to fit some data to this equation [img]http://www.originlab.com/ftp/forum_and_kbase/Images/Kdequation.jpg[/img] I know all the parameters except for k which varies. This equation works fine with my sigmoidal curve that looks like the one below [img]http://www.originlab.com/ftp/forum_and_kbase/Images/sigmoid-curve.jpg[/img] But I have a set of data that also looks like an "S" shaped curved except it's the opposite way (i.e. the top of the curve is at the lower x values). What changes can I do to still be able to get k for this type of curve? or do I need to try an find another entire equation for this? Thanks, [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.