Gompertz growth model for population studies, animal growth.
Reference: Seber, G. A. F., Wild, C. J. 1989. Nonlinear Regression. John Wiley & Sons, Inc. pp. 330 - 331
Number: 3
Names: a, xc, k
Meanings: a = amplitude, xc = center, k = coefficient
Lower Bounds: a > 0.0, k > 0.0
Upper Bounds: none
nlf_sgompertz(x,a,xc,k)
FITFUNC\GOMPERTZ.FDF
Growth/Sigmoidal