mgcv (version 1.7-4)

model.matrix.gam: Extract model matrix from GAM fit

Description

Obtains the model matrix from a fitted gam object.

Usage

## S3 method for class 'gam':
model.matrix(object, ...)

Arguments

object

fitted model object of class gam as produced by gam().

...

other arguments, passed to predict.gam.

Value

• A model matrix.

Details

Calls predict.gam with no newdata argument and type="lpmatrix" in order to obtain the model matrix of object.

References

Wood S.N. (2006b) Generalized Additive Models: An Introduction with R. Chapman and Hall/CRC Press.

See Also

gam

Examples

n <- 15
x <- runif(n)
y <- sin(x*2*pi) + rnorm(n)*.2
mod <- gam(y~s(x,bs="cc",k=6),knots=list(x=seq(0,1,length=6)))
model.matrix(mod)