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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        743        7.43        7.43
         11 |      5,247       52.47       59.90
         12 |        195        1.95       61.85
         13 |      2,062       20.62       82.47
         18 |         46        0.46       82.93
         19 |         11        0.11       83.04
         21 |        478        4.78       87.82
         22 |        202        2.02       89.84
         23 |        507        5.07       94.91
         28 |         22        0.22       95.13
         29 |         14        0.14       95.27
         31 |         21        0.21       95.48
         32 |         13        0.13       95.61
         33 |         18        0.18       95.79
         38 |          4        0.04       95.83
         41 |          2        0.02       95.85
         42 |          2        0.02       95.87
         43 |          1        0.01       95.88
         50 |         22        0.22       96.10
         51 |        190        1.90       98.00
         52 |         62        0.62       98.62
         53 |         14        0.14       98.76
         54 |          1        0.01       98.77
         55 |          8        0.08       98.85
         99 |        115        1.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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