Description Usage Format References
This example is from a clinical trial comparing two treatments for a respiratory illness (Strokes et al., 1995). In each of two centers, eligible patients were randomly assigned to active treatment or placebo. During treatment, respiratory status was determined at four visits. Potential explanatory variables were centre, sex, and baseline respiratory status (all dichotomous), as well as age(in years) at the time of study entry. There were 111 patients (54 active, 57 placebo).
1 | data("respiratory")
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A data frame with 444 observations on the following 8 variables.
patientpatients identifier for 111 patients
treatmenta factor for treatment with levels active and placebo
sexa factor for gender with levels female and male
ageage in years
centercenter number for two centers
baselinebaseline respiratory status (0 or 1)
pastrespiratory status in the previous visit
yrespiratory status (0=poor, 1=good)
Strokes, M.E., Davis, C.S., and Koch, G.G. (1995). Categorical Data Analysis using the SAS System. SAS Institute, Cary, NC.
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