->  codebook


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

                 range:  [1970,1983]                  units:  1
         unique values:  10                   coded missing:  0 / 10

                  mean:    1977.3
              std. dev:   4.21769

           percentiles:        10%       25%       50%       75%       90%
                             1971      1975    1977.5      1981    1982.5


total ----------------------------------------- Total Hippo Population Estimate
                  type:  numeric (int)

                 range:  [2342,6544]                  units:  1
         unique values:  10                   coded missing:  0 / 10

                  mean:    4536.1
              std. dev:   1431.22

           percentiles:        10%       25%       50%       75%       90%
                           2578.5      2919    4824.5      5151    6418.5

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