bdf                   package:nlme                   R Documentation

Language scores

Description:

     The 'bdf' data frame has 2287 rows and 25 columns of language
     scores from grade 8 pupils in elementary schools in The
     Netherlands.

Usage:

     data(bdf)

Format:

     schoolNR a factor denoting the school.

     pupilNR a factor denoting the pupil.

     IQ.verb a numeric vector of verbal IQ scores

     IQ.perf a numeric vector of IQ scores.

     sex Sex of the student.

     Minority a factor indicating if the student is a member of a
          minority group.

     repeatgr an ordered factor indicating if one or more grades have
          been repeated.

     aritPRET a numeric vector

     classNR a numeric vector

     aritPOST a numeric vector

     langPRET a numeric vector

     langPOST a numeric vector

     ses a numeric vector of socioeconomic status indicators.

     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.

     schoolSES a numeric vector

     satiprin a numeric vector

     natitest a factor with levels '0' and '1'

     meetings a numeric vector

     currmeet a numeric vector

     mixedgra a factor indicating if the class is a mixed-grade class.

     percmino a numeric vector

     aritdiff a numeric vector

     homework a numeric vector

     classsiz a numeric vector

     groupsiz a numeric vector

Source:

     <URL: http://stat.gamma.rug.nl/snijders/multilevel.htm>

References:

     Snijders, Tom and Bosker, Roel (1999), _Multilevel Analysis: An
     Introduction to Basic and Advanced Multilevel Modeling_, Sage.

Examples:

     data(bdf)
     summary(bdf)

