The 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.
Usage
data(ohio)
Format
This data frame contains the following columns:
resp
an indicator of wheeze status (1=yes, 0=no)
id
a numeric vector for subject id
age
a numeric vector of age, 0 is 9 years old
smoke
an indicator of maternal smoking at the first year of
the study
References
Fitzmaurice, G.M. and Laird, N.M. (1993) A likelihood-based method for
analyzing longitudinal binary responses, Biometrika80: 141–151.