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August 29th, 2008, 09:04 AM   #1
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Fitting sigmoid curve with three points

Hi,

There are three points on a plane (x1,y1), (x2,y2) and (x3,y3).

How to find m,n,k that (x1,y1), (x2,y2) and (x3,y3) satisfy

y1 = m*x1^n/(k^n+ x1^n)
y2 = m*x2^n/(k^n+ x2^n)
y3 = m*x3^n/(k^n+ x3^n)

Thanks
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