Penalty matrix constructor for cubic regression splines
constructs the penalty matrix associated with cubic regression splines basis. This function is called inside
crs.
crs.FP(knots, h)
knots |
Numeric vectors that specifies the knots of the splines (including boundaries) |
h |
vector of knots differences (corresponds to |
List of two elements:
F.mat |
matrix used in function |
P.mat |
penalty matrix |
library(survPen) # construction of the penalty matrix using a sequence of knots knots <- c(0,0.25,0.5,0.75,1) diff.knots <- diff(knots) crs.FP(knots,diff.knots)
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