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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        667        6.67        6.67
         11 |      5,420       54.20       60.87
         12 |        105        1.05       61.92
         13 |      1,862       18.62       80.54
         18 |          4        0.04       80.58
         19 |         14        0.14       80.72
         21 |        496        4.96       85.68
         22 |        200        2.00       87.68
         23 |        535        5.35       93.03
         28 |         22        0.22       93.25
         29 |         21        0.21       93.46
         31 |         20        0.20       93.66
         32 |         15        0.15       93.81
         33 |         19        0.19       94.00
         38 |          3        0.03       94.03
         39 |          6        0.06       94.09
         41 |          1        0.01       94.10
         42 |          1        0.01       94.11
         43 |          1        0.01       94.12
         50 |         17        0.17       94.29
         51 |        233        2.33       96.62
         52 |         84        0.84       97.46
         53 |         10        0.10       97.56
         55 |          9        0.09       97.65
         99 |        235        2.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016