mlmRev (version 1.0-8)

Chem97: Scores on A-level Chemistry in 1997

Description

Scores on the 1997 A-level Chemistry examination in Britain. Students are grouped into schools within local education authories. In addition some demographic and pre-test information is provided.

Usage

data(Chem97)

Format

A data frame with 31022 observations on the following 8 variables.

lea

Local Education Authority - a factor

school

School identifier - a factor

student

Student identifier - a factor

score

Point score on A-level Chemistry in 1997

gender

Student's gender

age

Age in month, centred at 222 months or 18.5 years

gcsescore

Average GCSE score of individual.

gcsecnt

Average GCSE score of individual, centered at mean.

Details

This data set is relatively large with 31,022 individuals in 2,280 schools. Note that while this is used, illustratively, to fit Normal response models, the distribution of the response is not well described by a Normal distribution.

References

Yang, M., Fielding, A. and Goldstein, H. (2002). Multilevel ordinal models for examination grades (submitted to Statistical Modelling).

Examples

# NOT RUN {
str(Chem97)
summary(Chem97)
(fm1 <- lmer(score ~ (1|school) + (1|lea), Chem97))
(fm2 <- lmer(score ~ gcsecnt + (1|school) + (1|lea), Chem97))
# }