Examples of Standard Nonlinear Curves

This figure is based on Figure 3.7.1 in the The Guide to Genstat^® – Part 2: Statistics. It shows the shape of curves representative of each type, although you should be aware that some curves, especially the rational functions, can vary greatly as their parameters change.

You can use this figure to help choose the type of curve to fit to your data. Click on a graph for details of the model it represents.

Exponential (SENSE=right)	Exponential (SENSE=left)	Line + Exponential (SENSE=right)
Line + Exponential (SENSE=left)	Critical Exponential (SENSE=right)	Critical Exponential (SENSE=left)
Double Exponential (SENSE=right)	Double Exponential (SENSE=left)	Logistic
Generalized Logistic	Gompertz (SENSE=right, β>0)	Gompertz (SENSE=left, β<0)
Gompertz (SENSE=right, β<0)	Gompertz (SENSE=left, β>0)	Emax
Generalized Emax	Linear divided by Linear	Quadratic divided by Linear
Quadratic divided by Quadratic	Fourier	Double Fourier
Gaussian	Double Gaussian

See also

• Standard Curves for information on general options and other curves
• Exponential Curves
• Fourier Curves
• Gaussian Curves
• Growth Curves
• Rational Curves
• Nonlinear Models menu
• Nonlinear Quantile Regression menu
• FITCURVE directive
• FITNONLINEAR directive
• FIT directive
• RQNONLINEAR procedure
• MINIMIZE procedure
• SIMPLEX procedure