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

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        776        7.76        7.76
         11 |      5,367       53.67       61.43
         12 |        240        2.40       63.83
         13 |      2,011       20.11       83.94
         18 |         49        0.49       84.43
         19 |         20        0.20       84.63
         21 |        414        4.14       88.77
         22 |        154        1.54       90.31
         23 |        437        4.37       94.68
         28 |         19        0.19       94.87
         29 |         57        0.57       95.44
         31 |          8        0.08       95.52
         32 |          8        0.08       95.60
         33 |         10        0.10       95.70
         38 |          2        0.02       95.72
         50 |         26        0.26       95.98
         51 |        130        1.30       97.28
         52 |         74        0.74       98.02
         54 |          9        0.09       98.11
         55 |         37        0.37       98.48
         99 |        152        1.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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