ohio data frame has 2148 rows and 4 columns. The dataset is a
subset of the six-city study, a longitudinal study of the health effects
of air pollution.
This data frame contains the following columns:
an indicator of wheeze status (1=yes, 0=no)
a numeric vector for subject id
a numeric vector of age, 0 to 9 years old
an indicator of maternal smoking at the first year of the study (1=yes, 0=no)
Fitzmaurice, G.M. and Laird, N.M. (1993) A likelihood-based method for analyzing longitudinal binary responses, Biometrika 80: 141–151.
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