Tool to approximate smooth functions by B-splines.

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Description

bsp is used to approximate smooth functions by B-splines.

Usage

1
bsp(x,kn)

Arguments

x

values of the explanatory variable.

kn

(optional) the number of internal knots . The default value is [n^{1/5}], where n is the sample size

.

Details

This function uses the routine bs() of the R package splines.

Value

x

the B-spline basis matrix, which is cubic.

Author(s)

Luz Marina Rondon <lumarp@gmail.com> and Heleno Bolfarine

References

De Boor, C. (1978). A practical Guide to Splines. Applied Mathematical Sciences. Springer-Verlag, New York.