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T O P I C R E V I E W
ezx6987e	Posted - 05/11/2015 : 12:19:04 PM Origin Ver. and Service Release (Select Help-->About Origin): Operating System:9.1.0 (64 bits) I'm a new user in Originpro and try to do a sigmoidal curve fitting of my data. I have problem in understanding the general solution of logistic equation as y=A2A1/(A1+(A2-A1)exp(-rx)) and compared to the equation in Originpro given as y=A2+(A1-A2)/(1+(x/xo)^p). Hopefully someone there kind enough to advice on my doubt. Thanks.
3 L A T E S T R E P L I E S (Newest First)
lkb0221	Posted - 05/12/2015 : 5:32:09 PM It's a 4PL equation: http://psg.hitachi-solutions.com/masterplex/blog/the-4-parameter-logistic-4pl-nonlinear-regression-model http://www.myassays.com/four-parameter-logistic-curve.assay https://www.medcalc.org/manual/nonlinearregression_example.php
ezx6987e	Posted - 05/11/2015 : 11:29:09 PM Hi Zheng, Appreciate your reply on this matter. For the logistic equation in the originpro which given as y=A2+(A1-A2)/(1+(x/xo)^p), any reference on how to derive this equation? This is because i could not find the relevant information. Thanks!
lkb0221	Posted - 05/11/2015 : 3:59:44 PM Hi, There are many kinds of logistic curves. You can try SLogistic3. http://www.originlab.com/doc/Origin-Help/SLogistic3-FitFunc Zheng OriginLab

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