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

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        821        8.21        8.21
         11 |      5,320       53.20       61.41
         12 |        246        2.46       63.87
         13 |      1,955       19.55       83.42
         18 |         46        0.46       83.88
         19 |         18        0.18       84.06
         21 |        418        4.18       88.24
         22 |        137        1.37       89.61
         23 |        442        4.42       94.03
         28 |         31        0.31       94.34
         29 |         35        0.35       94.69
         31 |         11        0.11       94.80
         32 |          9        0.09       94.89
         33 |         12        0.12       95.01
         38 |          1        0.01       95.02
         39 |          4        0.04       95.06
         41 |          1        0.01       95.07
         50 |         27        0.27       95.34
         51 |        190        1.90       97.24
         52 |         87        0.87       98.11
         53 |          9        0.09       98.20
         55 |         17        0.17       98.37
         99 |        163        1.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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