Main
NLS Page 		Ratkowsky2
Dataset
Additional Information
Dataset
Name:
Rat42

Procedure: Nonlinear Least Squares Regression
Certification Method & Definitions

Data: 1 Response Variable (y)
1 Predictor Variable (x)
9 Observations
Higher Level of Difficulty
Observed Data
Model: y = f(x;beta) + e = (beta(1) / (1 + exp[beta(2) - beta(3)x]) + e

This model and data are an example of fitting sigmoidal growth curves taken from Ratkowsky (1983). The response variable is pasture yield, and the predictor variable is growing time.