R: Evaluate a Spline Basis

predict.bs {splines}

R Documentation

Evaluate a Spline Basis

Description

Evaluate a predefined spline basis at given values.

Usage

predict.bs(object, newx, ...)
predict.ns(object, newx, ...)

Arguments

object

the result of a call to bs() or ns() having attributes describing knots, degree, etc.

newx

the x values at which evaluations are required.

...

Optional additional arguments. Presently no additional arguments are used.

Value

An object just like basis, except evaluated at the new values of x.

These are methods for the generic function predict() for objects inheriting from classes bs or ns. See predict for the general behavior of this function.

Examples

data(women)
basis <- ns(women$height, df = 5)
newX <- seq(58, 72, len = 51)
# evaluate the basis at the new data
predict(basis, newX)