epilepsy | R Documentation |
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.
data(epilepsy)
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 ). |
Thall, P.F. and Vail S.C. (1990). Some covariance models for longitudinal count data with overdispersion. Biometrics 46, 657–671.
Diggle, P.J., Heagerty, P., Liang, K.Y. and Zeger, S.L. (2002). Analysis of Longitudinal Data. Oxford: Oxford University Press. Second edition.
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