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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 ladyfloflo[/i] [br] Operating System: 8.1 SR3 V8.1.34.90 I am trying to fit my data with this known equation but it says that the fit did not converge though the equation did compiled! P= exp((t-A)/(B+G*(t-A)))/(exp((t-A)/(B+G*(t-A)))+(exp((-H*(t-A))/B)*((1-Ps)/Ps))) Where P is the dependent variable and t is the independent variable the parameters are A,B,G,H, and Ps. I also don't know where and how to write the script or code for initializing the parameters and/or the script before the fitting I wish the equation above to have these criteria: t> A-(B/G) P=0 for t<=A-(B/G) the range of P is P>=0 for all t>=0 For H>0, P approaches the limit of unity at t becomes very large At time t=A P=Ps I also put some initial values for the parameters which I have calculated and still does not converge! What can I do? Or what is the problem??? Any help would be greatly appreciate I can email some data points too. florence.janvier@gmail.com [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.