An object of class glm.spike. The object must be a
list with the following elements
beta: a matrix of MCMC draws, with rows representing draws,
and columns representing coefficients.
xlevels: the levels of any contrasts pres
newdata
A data frame, matrix, or vector containing the
predictors needed to make a prediction. If newdata is a
matrix it must have the same number of columns as
length(object$beta), unless it is off by one and the model
contains an in
na.action
A function specifying what to do with NA's.
...
Extra arguments passed to model.matrix, in the event
that newdata is a data frame.
Value
A matrix of predictor variables suitable for multiplication by
object$beta.