bdf {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

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)

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