The records the number of failures and operation time for groups of 10 pumps.

pump

Format

A data frame with 10 rows and 5 columns

y

Number of pump failures

t

Failure Time

group

Continuous Operation (=1) or Intermittent Operation(=2)

ID

ID for group of 10 pumps

logtstd

Centeredy operation times

Source

https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_nlmixed_sect040.htm

References

Gaver, D. P. and O'Muircheartaigh, I. G. (1987), "Robust Empirical Bayes Analysis of Event Rates," Technometrics, 29, 1-15.