The dataset is a subset of the six-city study, a longitudinal study of the health effects of air pollution.
OhioData frame with 2148 observations on the following 4 variables
respan indicator of wheeze status (1=yes, 0=no)
ida numeric vector for subject id
agea numeric vector of age, 0 is 9 years old
smokean indicator of maternal smoking at the first year of the study
Fitzmaurice, G.M. and Laird, N.M. (1993) A likelihood-based method for analyzing longitudinal binary responses, Biometrika 80: 141--151.
Halekoh, U., H<U+00F8>jsgaard, S. e Yan, J. (2005). The R package geepack for generalized estimating equations. Journal of Statistical Software, 15, 1-11.