Chemistry data frame has 31022 rows and 7 columns of the
A-level scores in Chemistry for England and Wales students, 1997.
This data frame contains the following columns:
school district ID.
a numeric vector of A-level scores in Chemistry.
a factor with levels
a numeric vector of ages of the subjects (months).
a numeric vector of average GCSE scores.
Fielding, A., Yang, M., and Goldstein, H. (2003) “Multilevel ordinal models for examination grades”. Statistical Modelling, 3, 127–53.