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

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        746        7.46        7.46
         11 |      5,303       53.03       60.49
         12 |        185        1.85       62.34
         13 |      2,046       20.46       82.80
         18 |         35        0.35       83.15
         19 |          7        0.07       83.22
         21 |        408        4.08       87.30
         22 |        190        1.90       89.20
         23 |        463        4.63       93.83
         28 |         37        0.37       94.20
         29 |         21        0.21       94.41
         31 |         14        0.14       94.55
         32 |          9        0.09       94.64
         33 |         14        0.14       94.78
         38 |          4        0.04       94.82
         39 |          2        0.02       94.84
         50 |         20        0.20       95.04
         51 |        260        2.60       97.64
         52 |         53        0.53       98.17
         53 |         10        0.10       98.27
         54 |          5        0.05       98.32
         55 |         17        0.17       98.49
         99 |        151        1.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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