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

summary(bdf)

[Package

*nlme* version 3.1-57

Index]