list2matrix.which {BAS}

Coerce a BAS list object into a matrix.

Description

Models, coefficients, and standard errors in objects of class 'bas' are represented as a list of lists to reduce storage by omitting the zero entries. These functions coerce the list object to a matrix and fill in the zeros to facilitate other computations.

Usage

list2matrix.which(x, which.models = NULL)

Arguments

x

a 'bas' object

which.models

a vector of indices use to extract a subset

Details

list2matrix.bas(x, which) is equivalent to list2matrix.which(x), however, the latter uses sapply rather than a loop. list2matrix.which and which.matrix both coerce x$which into a matrix.

Value

a matrix representation of x$what, with number of rows equal to the length of which.models or total number of models and number of columns x$n.vars

Author(s)

Merlise Clyde [e-mail]

See Also

bas

Other as.matrix methods: list2matrix.bas(), which.matrix()

Examples

data(Hald)
Hald.bic <-  bas.lm(Y ~ ., data=Hald, prior="BIC", initprobs="eplogp")
coef <- list2matrix.bas(Hald.bic, "mle")  # extract all ols coefficients
se <- list2matrix.bas(Hald.bic, "mle.se")
models <- list2matrix.which(Hald.bic)     #matrix of model indicators
models <- which.matrix(Hald.bic$which, Hald.bic$n.vars)     #matrix of model indicators