Chem97 {mlmRev} | R Documentation

## 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.

### Source

http://multilevel.ioe.ac.uk/softrev/chem97.html

### References

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

### Examples

    str(Chem97)
    summary(Chem97)
    (fm1 <- lmer(score ~ (1|school) + (1|lea), Chem97))
    (fm2 <- lmer(score ~ gcsecnt + (1|school) + (1|lea), Chem97))

[Package mlmRev version 1.0-6 Index]