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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        693        6.93        6.93
         11 |      5,419       54.19       61.12
         12 |        114        1.14       62.26
         13 |      1,941       19.41       81.67
         18 |          7        0.07       81.74
         19 |         16        0.16       81.90
         21 |        477        4.77       86.67
         22 |        199        1.99       88.66
         23 |        535        5.35       94.01
         28 |         26        0.26       94.27
         29 |         11        0.11       94.38
         31 |         19        0.19       94.57
         32 |         16        0.16       94.73
         33 |         13        0.13       94.86
         39 |          5        0.05       94.91
         41 |          1        0.01       94.92
         42 |          1        0.01       94.93
         43 |          1        0.01       94.94
         49 |          3        0.03       94.97
         50 |         31        0.31       95.28
         51 |        218        2.18       97.46
         52 |         35        0.35       97.81
         53 |         33        0.33       98.14
         55 |          8        0.08       98.22
         99 |        178        1.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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