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\name{bdf}
\title{Language Scores of 8-Graders in The Netherlands}
\alias{bdf}
\docType{data}
\usage{data(bdf)}
\description{
The \code{bdf} data frame has 2287 rows and 25 columns of language
scores from grade 8 pupils in elementary schools in The Netherlands.
}
\format{
\describe{
\item{schoolNR}{a factor denoting the school.}
\item{pupilNR}{a factor denoting the pupil.}
\item{IQ.verb}{a numeric vector of verbal IQ scores}
\item{IQ.perf}{a numeric vector of IQ scores.}
\item{sex}{Sex of the student.}
\item{Minority}{a factor indicating if the student is a member of a
minority group.}
\item{repeatgr}{an ordered factor indicating if one or more grades
have been repeated.}
\item{aritPRET}{a numeric vector}
\item{classNR}{a numeric vector}
\item{aritPOST}{a numeric vector}
\item{langPRET}{a numeric vector}
\item{langPOST}{a numeric vector}
\item{ses}{a numeric vector of socioeconomic status indicators.}
\item{denomina}{a factor indicating of the school is a public
school, a Protestant private school, a Catholic private school, or
a non-denominational private school.}
\item{schoolSES}{a numeric vector}
\item{satiprin}{a numeric vector}
\item{natitest}{a factor with levels \code{0} and \code{1}}
\item{meetings}{a numeric vector}
\item{currmeet}{a numeric vector}
\item{mixedgra}{a factor indicating if the class is a mixed-grade class.}
\item{percmino}{a numeric vector}
\item{aritdiff}{a numeric vector}
\item{homework}{a numeric vector}
\item{classsiz}{a numeric vector}
\item{groupsiz}{a numeric vector}
}
}
\references{
Snijders, Tom and Bosker, Roel (1999)
\emph{Multilevel Analysis: An Introduction to Basic and Advanced
Multilevel Modeling}, Sage.
}
\examples{
summary(bdf)
}
\keyword{datasets}
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