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

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        796        7.96        7.96
         11 |      5,315       53.15       61.11
         12 |        256        2.56       63.67
         13 |      1,810       18.10       81.77
         18 |         45        0.45       82.22
         19 |         50        0.50       82.72
         21 |        385        3.85       86.57
         22 |        152        1.52       88.09
         23 |        354        3.54       91.63
         28 |         22        0.22       91.85
         29 |         56        0.56       92.41
         31 |          5        0.05       92.46
         32 |          5        0.05       92.51
         33 |          7        0.07       92.58
         39 |          7        0.07       92.65
         50 |         30        0.30       92.95
         51 |        319        3.19       96.14
         52 |         60        0.60       96.74
         53 |          5        0.05       96.79
         54 |         10        0.10       96.89
         55 |          6        0.06       96.95
         99 |        305        3.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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