epilepsy {gcmr}

Epilitic Seizures Data

Description

Longitudinal study on epilitic seizures (Thall and Vail, 1990; Diggle et al. 2002). The data consist into 59 individuals with five observations each: The baseline eight-week interval and measurements collected at subsequent visits every two-week.

Usage

data(epilepsy)

Format

id	patient's id .
age	patient's age.
trt	indicator if the patient is treated with progabide (1) or with placebo (2).
counts	number of epileptic seizures.
time	observation period in weeks (8 for baseline and 2 for subsequent visits).
visit	indicator if observation at baseline (0) or subsequent visit (1).

Source

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

References

Diggle, P.J., Heagerty, P., Liang, K.Y. and Zeger, S.L. (2002). Analysis of Longitudinal Data. Oxford: Oxford University Press. Second edition.