Frequencies for first 10,000 rows of pct016050 variable in sf12000860us15 dataset :

   Crews of |
   maritime |
    vessels |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,975       99.75       99.75
          1 |          7        0.07       99.82
          2 |          2        0.02       99.84
          3 |          3        0.03       99.87
          4 |          1        0.01       99.88
          7 |          1        0.01       99.89
          8 |          1        0.01       99.90
         10 |          1        0.01       99.91
         11 |          1        0.01       99.92
         14 |          1        0.01       99.93
         18 |          1        0.01       99.94
         19 |          1        0.01       99.95
         26 |          1        0.01       99.96
         28 |          1        0.01       99.97
         30 |          1        0.01       99.98
         74 |          1        0.01       99.99
        121 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017