Epilesy Data

Description

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.

Usage

data("epilepsy")

Format

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.

References

Thall, P. F. and Vail, S. C. (1990) Some covariance models for longitudinal count data with overdispersion In Biometrics 46, 657–671

Results