engineering
posted by Candy .
why exponential model may be better choice for modelling data than the linear model.

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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