Bootstrap methods are presented for constructing s-confrdence regions for t
he s-expected ROCOF (rate of occurrence of failures) of a repairable system
. This is based on the work of Cowling, et nl. (1996) for the intensity fun
ction of a NHPP (nonhomogeneous Poisson process). The method is applied to
the operating times of unscheduled maintenance actions for a diesel engine
of the USS Grampus given by Lee (1980) and also analyzed by Crowder, et al.
(1991).