Data frame giving the number of damage incidents and aggregate months of service by ship type, year of construction, and period of operation.
"A"
to
"E"
"60"
,
"65"
,
"70"
,
"75"
)
P. McCullagh and J. A. Nelder, (1983), Generalized Linear Models. Chapman & Hall, section 6.3.2, page 137