->  codebook


age --------------------------------------------------- Lake trout age in years
                  type:  numeric (byte)

                 range:  [1,12]                       units:  1
         unique values:  11                   coded missing:  0 / 28

                  mean:   5.53571
              std. dev:    3.5432

           percentiles:        10%       25%       50%       75%       90%
                                1       2.5       5.5         8        12


pcb --------------------------------------------------- PCB concentration (ppm)
                  type:  numeric (float)

                 range:  [.5,30.4]                    units:  .1
         unique values:  26                   coded missing:  0 / 28

                  mean:   7.17143
              std. dev:   7.49562

           percentiles:        10%       25%       50%       75%       90%
                              1.2       2.1       4.3      10.1      17.5

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