Frequencies for first 10,000 rows of seat_pos variable in person dataset :

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        790        7.90        7.90
          1 |      5,287       52.87       60.77
          2 |        325        3.25       64.02
          3 |      1,580       15.80       79.82
          4 |        333        3.33       83.15
          5 |        143        1.43       84.58
          6 |        292        2.92       87.50
          7 |          3        0.03       87.53
          8 |          5        0.05       87.58
          9 |          4        0.04       87.62
         10 |         53        0.53       88.15
         13 |        270        2.70       90.85
         14 |         11        0.11       90.96
         99 |        904        9.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016