integrateIspline: Integral of I-splines

In SCCS: The Self-Controlled Case Series Method

Integral of I-splines

Description

Evaluates design matrix for integrals of I-splines and integrals of the integrals. The function evaluates first, second and third integrals of I-splines.

Usage

integrateIspline(x, knots1, m, int)

Arguments

x	a numeric vector of values at which to evaluate the integrals of I-spline functions
knots1	a numeric vector of interior knot positions with non-decreasing values
m	a positive integer giving the order of the spline function.
int	a positive integer (1, 2, or 3) for first, second or third integral of an I-spline function.

Value

A matrix with length of (x) rows and length of (knots1) - m columns.

Author(s)

Yonas Ghebremichael-Weldeselassie, Heather Whitaker, Paddy Farrington.

References

Ghebremichael-Weldeselassie Y. (2014). Smooth risk functions for self-cotrolled case series models. PhD thesis, The Open University.

Ghebremichael-Weldeselassie, Y., Whitaker, H. J., Farrington, C. P. (2015). Spline-based self controlled case series method. Statistics in Medicine 33:639-649.

SCCS documentation built on July 5, 2022, 5:05 p.m.