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This is a subset of the Xerophthalmia data described in Diggle et al. (2002) and Zeger and Karim (1991).

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A list with the following four components.

- y
Binary response variable. If the child suffers from xerophthalmia.

- grp
Grouping variable comprising the child id.

- X
Fixed-effect design matrix. The first column is the intercept, then age, xero, cos, sin, sex, height and stunt. The covariates are all standardized with mean 0 and variance 1.

- Z
Random-effects design matrix for a random-intercept model.

A detailed description of the covariates can be found in Diggle et. al. and Zeger and Karim (1991).

http://faculty.washington.edu/heagerty/Books/AnalysisLongitudinal/xerop.data

Peter J. Diggle, Patrick Heagerty, Kung-Yee Liang and Scott L. Zeger
(2002), *Analysis of Longitudinal Data*, Oxford University Press.

Scott L. Zeger and M. Rezaul Karim (1991), *Generalized Linear
Models With Random Effects; A Gibbs Sampling Approach*, Journal of the American Statistical Association, Vol. 86, No. 413 (Mar., 1991), pp. 79-86.

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