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

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        820        8.20        8.20
         11 |      5,252       52.52       60.72
         12 |        249        2.49       63.21
         13 |      1,892       18.92       82.13
         18 |         43        0.43       82.56
         19 |         33        0.33       82.89
         21 |        398        3.98       86.87
         22 |        145        1.45       88.32
         23 |        342        3.42       91.74
         28 |         26        0.26       92.00
         29 |         70        0.70       92.70
         31 |          8        0.08       92.78
         32 |          5        0.05       92.83
         33 |          7        0.07       92.90
         42 |          1        0.01       92.91
         43 |          1        0.01       92.92
         50 |         15        0.15       93.07
         51 |        239        2.39       95.46
         52 |         69        0.69       96.15
         53 |         17        0.17       96.32
         54 |          3        0.03       96.35
         55 |         16        0.16       96.51
         99 |        349        3.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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