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 |      5,396       53.96       62.17
         12 |        271        2.71       64.88
         13 |      1,939       19.39       84.27
         18 |         42        0.42       84.69
         19 |         31        0.31       85.00
         21 |        434        4.34       89.34
         22 |        159        1.59       90.93
         23 |        392        3.92       94.85
         28 |         29        0.29       95.14
         29 |         36        0.36       95.50
         31 |          6        0.06       95.56
         32 |          7        0.07       95.63
         33 |          7        0.07       95.70
         38 |          1        0.01       95.71
         50 |         23        0.23       95.94
         51 |        136        1.36       97.30
         52 |         75        0.75       98.05
         53 |          4        0.04       98.09
         54 |          5        0.05       98.14
         55 |         26        0.26       98.40
         99 |        160        1.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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