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Data frame giving the number of damage incidents and aggregate months of service by ship type, year of construction, and period of operation.
ships
type
type: "A" to "E".
"A"
"E"
year
year of construction: 1960--64, 65--69, 70--74, 75--79 (coded as "60", "65", "70", "75").
"60"
"65"
"70"
"75"
period
period of operation : 1960--74, 75--79.
service
aggregate months of service.
incidents
number of damage incidents.