SLogistic1

Contents

Function

y=\frac a{1+e^{-k\left( x-x_c\right) }}

Brief Description

Sigmoidal logistic function, type 1.

Reference: Seber, G. A. F., Wild, C. J. 1989. Nonlinear Regression. John Wiley & Sons, Inc. pp. 328 - 330

Sample Curve

Image:CFF Image464.jpg

Parameters

Number: 3

Names: a, xc, k

Meanings: a = amplitude, xc = center, k = coefficient

Lower Bounds: xc > 0

Upper Bounds: none

Script Access

 nlf_slogistic1(x,a,xc,k)

Function File

FITFUNC\SLOGIST1.FDF

Category

Growth/Sigmoidal