Generates b1(p), b2(p), … such that, for 0 < p < 1,
θ1*b1(p) + θ2*b2(p) + …
is a piecewise linear function with slopes θ1, θ2, ….
a numeric vector of values between 0 and 1.
a set of internal knots between 0 and 1. It can be NULL for no internal knots.
This function permits computing a piecewise linear function on the unit interval. A different slope holds between each pair of knots, and the function is continuous at the knots.
A matrix with one row for each element of p, and
length(knots) + 1 columns.
The knots are returned as
Any linear combination of the basis matrix is a piecewise linear function where
each coefficient represents the slope in the corresponding sub-interval (see ‘Examples’).
This function is typically used within a call to
A piecewise linear function can be used to describe how quantile regression coefficients
depend on the order of the quantile.
Paolo Frumento [email protected]
slp, for shifted Legendre polynomials.
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