Posted by Candy on Saturday, June 19, 2010 at 5:49am.
If the change of something tends to be proportional to its present value, exponential fit works best.
dx/dt = k x
dx/x = k dt
ln x = k t + c
e^ln x = e^(kx+c)
x = e^kx * e^c
x = C e^kx
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