Model Browser User's Guide

Local Model Class: Free Knot Spline

These are the same as the Global Model Class: Free Knot Spline (which is also only available for one input factor). See the global free knot splines for an example curve shape.

A spline is a piecewise polynomial, where different sections of polynomial are fitted smoothly together. The point of the join is called the knot.

You can choose the number of knots. The order of polynomial fitted (in all curve sections) is cubic. The "B" in B-spline stands for Basis, after the polynomial basis function used for the curve sections.

You can set the number of Random starting points. These are the number of initial guesses at the knot positions.

See also

• Polynomial Spline, where you can choose different order basis functions for either side of the knot
• Local Model Class: Truncated Power Series, where you can choose the order of the basis function
• Hybrid Splines, a global model where you can choose a spline order for one of the factors (the rest have polynomials fitted)

Local Model Class: Truncated Power Series

Local Model Class: Growth Models