bdf: Language scores
In nlme: Linear and Nonlinear Mixed Effects Models

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")

nlme documentation built on Nov. 27, 2023, 5:09 p.m.