Scores attained by 3435 Scottish secondary school students on a standardized test taken at age 16. Both the primary school and the secondary school that the student attended have been recorded.
A data frame with 3435 observations on the following 6 variables.
The verbal reasoning score on a test taken by the students on entry to secondary school.
The score attained on the standardized test taken at age 16.
A factor indicating the primary school that the student attended.
A factor with levels
The student's social class on a numeric scale from low to high social class.
A factor indicating the secondary school that the student attended.
These data are an example of cross-classified grouping factors.
Paterson, L. (1991). Socio economic status and educational attainment: a multidimensional and multilevel study. Evaluation and Research in Education 5: 97-121.