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% Copyright (C) 1998
% Berwin A. Turlach <bturlach@stats.adelaide.edu.au>
% Bill Venables <wvenable@stats.adelaide.edu.au>
% $Id: vcov.l1ce.d,v 1.2 1999/12/01 05:11:56 bturlach Exp $
% --> ../COPYRIGHT for more details
\name{vcov.l1ce}
\alias{vcov.l1ce}
\alias{vcov.l1celist}
\title{Variance-Covariance Matrix of `l1ce' or `l1celist' Objects}
\usage{
\method{vcov}{l1ce}(object, type = c("OPT", "Tibshirani"),
gen.inverse.diag = 0, \dots)
\method{vcov}{l1celist}(object, type = c("OPT", "Tibshirani"),
gen.inverse.diag = 0, \dots)
}
\arguments{
\item{object}{an object of class \code{l1ce} or \code{l1celist}.}
\item{type}{character indicating whether to use the covariance formula
of Osborne, Presnell and Turlach or the formula of Tibshirani.}
\item{gen.inverse.diag}{if Tibshirani's formula for the covariance
matrix is used, this value is used for the diagonal elements of the
generalised inverse that appears in the formula that corresponds to
parameters estimated to be zero. The default is 0, i.e. use the
Moore-Penrose inverse. Tibshirani's code uses
\code{gen.inverse.diag = 1e11}.}
\item{\dots}{further potential arguments passed to methods.}
}
\description{
This is a method for the function \code{vcov()} for objects inheriting
from class \code{l1ce} or \code{l1celist} (see
\code{help(\link{l1ce.object})} and
\code{help(\link{l1celist.object})}). See \code{\link{vcov}} for the
general behavior of this function.
}
\keyword{models}
% Converted by Sd2Rd version 1.21.
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