Description Usage Format Source References Examples
This data set consider information from a clinical trial of 59 epileptics, reported by Thall and Vail (1990). For each patient, the number of epileptic seizures was recorded during a baseline period of eight weeks. Patients were then randomized to treatment with the anti-epileptic drug progabide, or to aplacebo in addition to standard chemotherapy. The number of seizures was then recorded in four consecutive two-weeks intervals.
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A data frame with 295 observations on the following 5 variables.
id
an ordered factor giving a unique identifier for the subject in the study.
seize
a numeric vector giving the number of epileptic seizures.
visit
a numeric vector giving the number of the visit, 0=baseline, and 1,2,3, and 4 for the four consecutive two-weeks intervals.
trt
a numeric vector giving the treatment group.
age
a numeric vector giving the age at the entry.
Thall, P.F., and Vail, S.C. (1990) Some covariance models for longitudinal count data with ovserdispersion, Biometrics, 46: 657-671.
Diggle, P.J., Liang, K-Y., and Zeger, S.L. (1994) Analysis of longitudinal data. Oxford: Clarendon Press.
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