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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        755        7.55        7.55
         11 |      5,711       57.11       64.66
         12 |         55        0.55       65.21
         13 |      1,669       16.69       81.90
         18 |          3        0.03       81.93
         19 |          3        0.03       81.96
         21 |        487        4.87       86.83
         22 |        198        1.98       88.81
         23 |        532        5.32       94.13
         28 |          6        0.06       94.19
         29 |         19        0.19       94.38
         31 |         26        0.26       94.64
         32 |         13        0.13       94.77
         33 |         18        0.18       94.95
         38 |          2        0.02       94.97
         39 |         25        0.25       95.22
         50 |         24        0.24       95.46
         51 |        188        1.88       97.34
         52 |         28        0.28       97.62
         53 |          1        0.01       97.63
         54 |          2        0.02       97.65
         55 |          9        0.09       97.74
         99 |        226        2.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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