s {stm}

Make a B-spline Basis Function

Description

This is a simple wrapper around the bs function in the splines package. It will default to a spline with 10 degrees of freedom.

Usage

s(x, df, ...)

Arguments

x

The predictor value.

df

Degrees of freedom. Defaults to the minimum of 10 or one minus the number of unique values in x.

...

Arguments passed to the bs function.

Details

This is a simple wrapper written as users may find it easier to simply type s rather than selecting parameters for a spline. We also include predict and makepredictcall generic functions for the class so it will work in settings where predict is called.

Value

A predictor matrix of the basis functions.

See Also

bs ns