73 subjects, with 4 repeated measures in quarters 1 to 4; variables are id, time, age, sex, msmok, y. For the variables, y is the count response variable for the number of visits to the hospital, quarterly over a one-year period; id=identification code, time=quarter, age=age in months at the beginning of the study, sex=0 for male and 1 for female, msmok=maternal smoking status (1 for yes, 0 for no).
This data set is on page 342, Table 9.22, Problem 9.12 of "Statistical methods for the analysis of repeated measurements", by Charles S. Davis.
The original source is: "Karim MR and Zeger SL (1988). GEE: A SAS macro for longitudinal data analysis. Technical Report 674, Department of Biostatistics, The Johns Hopkins University, Baltimore."
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