Make a B-spline Basis Function
This is a simple wrapper around the bs function in
the splines package. It will default to a spline with 10 degrees of
freedom.
s(x, df, ...)
x |
The predictor value. |
df |
Degrees of freedom. Defaults to the minimum of 10 or one minus the number of unique values in x. |
... |
Arguments passed to the |
This is a simple wrapper written as users may find it easier to simply type
s rather than selecting parameters for a spline. We also include
predict and makepredictcall generic functions for the class
so it will work in settings where predict is called.
A predictor matrix of the basis functions.
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