->  codebook


year --------------------------------------------------------------------- Year
                  type:  numeric (int)

                 range:  [1973,1985]                  units:  1
         unique values:  13                   coded missing:  0 / 13

                  mean:      1979
              std. dev:   3.89444

           percentiles:        10%       25%       50%       75%       90%
                             1974      1976      1979      1982      1984


tankers ---------------------------------------------- Number of Tankers Afloat
                  type:  numeric (int)

                 range:  [3285,4237]                  units:  1
         unique values:  13                   coded missing:  0 / 13

                  mean:   3880.15
              std. dev:   297.988

           percentiles:        10%       25%       50%       75%       90%
                             3424      3750      3937      4137      4229


spills ------------------------------------------- Number Accidental Oil Spills
                  type:  numeric (byte)

                 range:  [8,65]                       units:  1
         unique values:  13                   coded missing:  0 / 13

                  mean:   32.3846
              std. dev:   16.9683

           percentiles:        10%       25%       50%       75%       90%
                                9        17        33        45        49


lost -------------------------------------------- Oil Lost, million metric tons
                  type:  numeric (float)

                 range:  [1.7,723.5]                  units:  .1
         unique values:  13                   coded missing:  0 / 13

                  mean:   180.808
              std. dev:   198.339

           percentiles:        10%       25%       50%       75%       90%
                               15      45.3     135.6     213.1     387.8

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