model.matrix {BoomSpikeSlab}

GetPredictorMatrix

Description

Extract the matrix of predictors.

Usage

  GetPredictorMatrix(object, newdata, na.action = na.omit, ...)

Arguments

object

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 present in the original training data.

• contrasts: the "contrasts" attribute of the original design matrix used to train the model.

• terms: the terms of the formula used to fit the original model.

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$beta), unless it is off by one and the model contains an intercept, in which case an intercept term will be added. If length(object$beta) == 1 (or 2, with one element containing an intercept) then newdata can be a numeric vector.

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.

Author(s)

Steven L. Scott

See Also

lm.spike SpikeSlabPrior plot.lm.spike predict.lm.spike