bdf | 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’, the first edition of http://www.stats.ox.ac.uk/~snijders/mlbook.htm.

### References

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

### Examples

```
summary(bdf)
## More examples, including lme() fits reproducing parts in the above
## book, are available in the R script files
system.file("mlbook", "ch04.R", package ="nlme") # and
system.file("mlbook", "ch05.R", package ="nlme")
```