28.1.174 SWeibull2

Function

 y=A-\left( A-B\right) e^{-\left( kx\right) ^d}

Brief Description

Sigmoidal Weibull function, type 2.

Sample Curve

CFF Image492.jpg

Parameters

Number: 4

Names: a, b, d, k

Meanings: a = top asymptote, b = unknown, d = power, k = coefficient

Lower Bounds: a > 0.0, b > 0.0, k > 0.0

Upper Bounds: none

Script Access

 nlf_sweibull2(x,a,b,d,k)

Function File

FITFUNC\WEIBULL2.FDF

Category

Growth/Sigmoidal