epilepsy | R Documentation |
Data from an experiment with $i=1,...,59$ epilepsy patients. Each of the patients was assigned to a control group or a treatment group. The experiment recorded the number of seizures experienced by each patient over four two-week periods. The experiment also recorded a baseline count of the number of seizures the patients had experienced during the previous eight weeks.
data("epilepsy")
A data frame with 236 observations on the following 6 variables.
count
Number of seizures experienced.
id
Patient ID.
group
Treatment or control groups.
age
The logarithm of the patient's age.
base
The logarithm of baseline/4.
visit
The corresponding time period.
Thall, P. F. and Vail, S. C. (1990) Some covariance models for longitudinal count data with overdispersion In Biometrics 46, 657–671
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