ships(MASS) R Documentation 

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

Usage
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 
> ships
   type year period service incidents
1     A   60     60     127         0
2     A   60     75      63         0
3     A   65     60    1095         3
4     A   65     75    1095         4
5     A   70     60    1512         6
6     A   70     75    3353        18
7     A   75     60       0         0
8     A   75     75    2244        11
9     B   60     60   44882        39
10    B   60     75   17176        29
11    B   65     60   28609        58
12    B   65     75   20370        53
13    B   70     60    7064        12
14    B   70     75   13099        44
15    B   75     60       0         0
16    B   75     75    7117        18
17    C   60     60    1179         1
18    C   60     75     552         1
19    C   65     60     781         0
20    C   65     75     676         1
21    C   70     60     783         6
22    C   70     75    1948         2
23    C   75     60       0         0
24    C   75     75     274         1
25    D   60     60     251         0
26    D   60     75     105         0
27    D   65     60     288         0
28    D   65     75     192         0
29    D   70     60     349         2
30    D   70     75    1208        11
31    D   75     60       0         0
32    D   75     75    2051         4
33    E   60     60      45         0
34    E   60     75       0         0
35    E   65     60     789         7
36    E   65     75     437         7
37    E   70     60    1157         5
38    E   70     75    2161        12
39    E   75     60       0         0
40    E   75     75     542         1