Variables:
A data frame with 555 observations on the following 8 variables.
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centre
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the study center, a factor with levels 1 and 2.
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treatment
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the treatment arm, a factor with levels placebo and treatment.
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sex
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a factor with levels female and male.
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age
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the age of the patient.
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status
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the respiratory status (response variable), a factor with levels poor and good.
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month
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the month, each patient was examined at months 0, 1, 2, 3 and 4.
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subject
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the patient ID, a factor with levels 1 to 111.
Details
In each of two centres, eligible patients were randomly assigned to active treatment or placebo. During the treatment, the respiratory status (categorised poor or good) was determined at each of four, monthly visits. The trial recruited 111 participants (54 in the active group, 57 in the placebo group) and there were no missing data for either the responses or the covariates. The question of interest is to assess whether the treatment is effective and to estimate its effect.
Note that the data are in long form, i.e, repeated measurments are stored as additional rows in the data frame.
