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\title{Language scores}
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The \code{bdf} data frame has 2287 rows and 25 columns of language
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scores from grade 8 pupils in elementary schools in The Netherlands.
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\item{schoolNR}{a factor denoting the school.}
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\item{pupilNR}{a factor denoting the pupil.}
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\item{IQ.verb}{a numeric vector of verbal IQ scores}
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\item{IQ.perf}{a numeric vector of IQ scores.}
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\item{sex}{Sex of the student.}
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\item{Minority}{a factor indicating if the student is a member of a
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\item{repeatgr}{an ordered factor indicating if one or more grades
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\item{aritPRET}{a numeric vector}
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\item{classNR}{a numeric vector}
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\item{aritPOST}{a numeric vector}
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\item{langPRET}{a numeric vector}
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\item{langPOST}{a numeric vector}
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\item{ses}{a numeric vector of socioeconomic status indicators.}
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\item{denomina}{a factor indicating of the school is a public
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school, a Protestant private school, a Catholic private school, or
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a non-denominational private school.}
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\item{schoolSES}{a numeric vector}
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\item{satiprin}{a numeric vector}
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\item{natitest}{a factor with levels \code{0} and \code{1}}
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\item{meetings}{a numeric vector}
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\item{currmeet}{a numeric vector}
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\item{mixedgra}{a factor indicating if the class is a mixed-grade class.}
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\item{percmino}{a numeric vector}
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\item{aritdiff}{a numeric vector}
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\item{homework}{a numeric vector}
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\item{classsiz}{a numeric vector}
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\item{groupsiz}{a numeric vector}
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\url{http://stat.gamma.rug.nl/snijders/multilevel.htm}
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Snijders, Tom and Bosker, Roel (1999), \emph{Multilevel Analysis: An
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Introduction to Basic and Advanced Multilevel Modeling}, Sage.