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.
epilA data.frame with 236 rows and 9 variables (columns):
the count for the 2-week period.
treatment, "placebo" or "progabide".
the counts in the baseline 8-week period.
subject's age, in years.
0/1 indicator variable of period 4.
subject number, 1 to 59.
period, 1 to 4.
log-counts for the baseline period, centred to have zero mean.
log-ages, centred to have zero mean.
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth Edition. Springer.