Data frame giving the number of damage incidents and aggregate months of service by ship type, year of construction, and period of operation.

ships

Format

type

type: "A" to "E".

year

year of construction: 1960--64, 65--69, 70--74, 75--79 (coded as "60", "65", "70", "75").

period

period of operation : 1960--74, 75--79.

service

aggregate months of service.

incidents

number of damage incidents.

Source

P. McCullagh and J. A. Nelder, (1983), Generalized Linear Models. Chapman & Hall, section 6.3.2, page 137