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logist3: Three Parameter Logistic

Description

Calculates three parameter logistic function

Usage

logist3(x, a, b, c)

Value

Numerical output of the function described in details

Arguments

x

Independent variable

a

First parameter. See details

b

Second parameter

c

Third parameter

Author

William R. Fairweather

Details

Calculates y = a/(1 + xx), where xx = exp(-(x - b)/c)