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segmented (version 2.1-1)

model.matrix.stepmented: Design matrix for stepmented fits

Description

This function builds the model matrix for stepmented fits.

Usage

# S3 method for stepmented
model.matrix(object, type=c("cdf","abs","none"), k=NULL, ...)

Value

The design matrix for a stepmented regression model with the specified formula and data

Arguments

object

A stepmented fit

k

The (negative) exponent of the sample size to approximate the absolute value; see vcov.stepmented for details.

type

The approximation for the indicator function/absolute value. If "none", the simple matrix with the original indicator values is returned. type='abs' is not yet allowed.

...

additional arguments

Author

Vito Muggeo

Details

If type="none", model.matrix.stepmented return the design matrix including the indicator function values and ignoring the psi terms.

See Also

See Also as model.matrix, vcov.stepmented