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\name{read.betas}
\alias{read.betas}
\title{Function to read in eiMD parameter chains saved to disk}
\description{
In \code{\link{ei.MD.bayes}}, users have the option to save parameter
chains for the unit-level betas to disk rather than returning them to
the workspace. This function reconstructs the parameter chains by
reading them back into R and producing either an array or an
\code{mcmc} object.
}
\usage{
read.betas(rows, columns, units, dir = NULL, ret.mcmc = TRUE)
}
\arguments{
\item{rows}{a character vector of the row marginals to be read back
in}
\item{columns}{a character vector of the column marginals to be read
back in}
\item{units}{a character of numeric vector with the units to be read
back in}
\item{dir}{an optional character string identifying the directory in
which parameter chains are stored (defaults to \code{getwd})}
\item{ret.mcmc}{a logical value specifying whether to return the
parameters as an \code{mcmc} object (defaults to \code{TRUE})}
}
\value{
If \code{ret.mcmc = TRUE}, an \code{mcmc} object with row names
corresponding to the parameter chains. If \code{ret.mcmc = FALSE}, an
array with dimensions named according to the selected \code{rows},
\code{columns}, and \code{units}.
}
\author{Olivia Lau <olivia.lau@post.harvard.edu>}
\seealso{\code{\link{ei.MD.bayes}},\code{mcmc}}
\keyword{IO}
\keyword{utilities}
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