Ispline | R Documentation |

Generates the I-spline basis matrix associated with integrated spline basis functions. Created by Cai and Wang in October, 2009.

Ispline(x, order, knots)

`x` |
the predictor variables. |

`order` |
the order of the basis functions. |

`knots` |
a sequence of increasing points specifying the placement of the knots. |

An I-spline basis matrix of dimension c(length(knots)+order-2, length(x)).

Wang, L., McMahan, C., and Hudgens, M. (2014+). A flexible and computationally efficient method for fitting the proportional hazards model to interval censored data. Submitted.

Ramsay, J. (1988). Monotone regression splines in action. Statistical Science 3, 425-441.

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