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

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        723        7.23        7.23
         11 |      5,405       54.05       61.28
         12 |        232        2.32       63.60
         13 |      2,058       20.58       84.18
         18 |         31        0.31       84.49
         19 |         31        0.31       84.80
         21 |        424        4.24       89.04
         22 |        184        1.84       90.88
         23 |        435        4.35       95.23
         28 |         23        0.23       95.46
         29 |         28        0.28       95.74
         31 |         14        0.14       95.88
         32 |          9        0.09       95.97
         33 |         11        0.11       96.08
         38 |          1        0.01       96.09
         39 |          1        0.01       96.10
         41 |          1        0.01       96.11
         42 |          1        0.01       96.12
         43 |          1        0.01       96.13
         50 |         15        0.15       96.28
         51 |        155        1.55       97.83
         52 |         62        0.62       98.45
         53 |          5        0.05       98.50
         55 |         17        0.17       98.67
         99 |        133        1.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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