| epil {qif} | R Documentation |
Seizure Counts for Epileptics
Description
The data set consists of seizure counts for 59 individuals with epilepsy. Counts were recorded for four two-week periods (8 weeks total). Age is the only covariate.
Usage
epil
Format
A data.frame with 236 rows and 9 variables (columns):
- y
the count for the 2-week period.
- trt
treatment, "placebo" or "progabide".
- base
the counts in the baseline 8-week period.
- age
subject's age, in years.
- V4
0/1 indicator variable of period 4.
- subject
subject number, 1 to 59.
- period
period, 1 to 4.
- lbase
log-counts for the baseline period, centred to have zero mean.
- lage
log-ages, centred to have zero mean.
Source
Thall, P. F. and Vail, S. C. (1990) Some covariance models for longitudinal count data with over-dispersion. Biometrics 46, 657–671.
References
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth Edition. Springer.