The records the number of failures and operation time for groups of 10 pumps.
A data frame with 10 rows and 5 columns
Number of pump failures
Continuous Operation (=1) or Intermittent Operation(=2)
ID for group of 10 pumps
Centeredy operation times
Gaver, D. P. and O'Muircheartaigh, I. G. (1987), "Robust Empirical Bayes Analysis of Event Rates," Technometrics, 29, 1-15.