The major concern with this data set is the association between the risk of respiratory infection and maternal smoking. The data were reported by Ware et al. (1984). This data frame includes the sixteen cases from two cities that was analyzed by Lipsitz et al. (1994). There are 64 observations.
integer case number.
Lipsitz, S.H., Fitzmaurice, G.M., Orav, E.J., and Laird, N. M. (1994). Performance of Generalized Estimating Equations in Practical Situations. Biometrics 50 270-278.
Ware, J.A., Dockery, S.A., Speizer, F.E., and Ferris, B.G. (1984). Passive Smoking, Gas Cooking, and Respiratory Health of Children Living in Six Cities. American Review of Respiratory Diseases 129 366-374.
gee(wheeze~age+smoke, cluster=case,family="binomial", link="logit", variance="glm.scale", correlation="exchangeable", data=Wheeze, start=list(regression=c(0,0,0)))