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Equation of a sigmoid
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Using GeoGebra I drew the curve of an acidbase titration. To find the equivalence point, I have to calculate the point where the second derivative is equal to zero. But to do this, I need the equation that describes the sigmoid. With GeoGebra, is it possible to do this?
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Sorry, what equation did you use to draw? You're the only one who knows it. So if you share your file your problem could be more clear to others too
https://en.wikipedia.org/wi...
try FitLogistic( <List of Points> )
it is easy to create the points in column C writing (A1,B1) then select C1 and drag and drop the little blue square right down of selection rectangle
I did three fits and I think that (xk)^1/3 is the best but not sigmoid. k is the inflection point
https://www.geogebra.org/cl...
perhaps a traslation of points gives better result
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