This is a subset of the Classroom Study described in West et. al. (2007) with 156 observations and 6 variables.

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A list with the following four components.

- y
Response variable. The students math achievement gain.

- grp
Grouping variable comprising the class of the students.

- X
Fixed-effect design matrix. The first column is the intercept, then sex, minority, mathkind, ses, yearstea and mathprep.

- Z
Random-effects design matrix. Only one column in order to fit a random intercept model.

A detailed description of the covariates can be found in West et. al. (2007) and was carried out by Hill et. al. (2005)

http://www-personal.umich.edu/~bwest/classroom.csv

Brady T. West, Kathleen B. Welch and Andrzei T. Galecki (2007),
*Linear Mixed Models, A Practical Guide Using Statistical
Software*,Chapman and Hall.

H.C. Hill, B. Rowan and D.L. Ball (2005) *"Effect of teachers"
mathematical knowledge for teaching on student achievements*, American
Educational Research Journal, 42, 371-406.

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