getBbasis {spatsurv}

getBbasis function

Description

A function returning the piecewise polynomial coefficients for a B-spline basis function i.e. the basis functions.

Usage

getBbasis(x, knots, degree, force = FALSE)

Arguments

x

a vector of data

knots

a vector of knots in ascending order. The first and last knots must be respectively the minimum and maximum of x.

degree

the degree of the spline

force

logical: skip check on knots? (not recommended!)

Value

the knots and the piecewise polynomial coefficients for a B-spline basis function i.e. the basis functions.