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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        760        7.60        7.60
         11 |      5,266       52.66       60.26
         12 |        149        1.49       61.75
         13 |      1,971       19.71       81.46
         18 |         31        0.31       81.77
         19 |         23        0.23       82.00
         21 |        460        4.60       86.60
         22 |        193        1.93       88.53
         23 |        507        5.07       93.60
         28 |         15        0.15       93.75
         29 |         36        0.36       94.11
         31 |         14        0.14       94.25
         32 |         19        0.19       94.44
         33 |         17        0.17       94.61
         39 |          5        0.05       94.66
         41 |          1        0.01       94.67
         43 |          3        0.03       94.70
         49 |          1        0.01       94.71
         50 |         12        0.12       94.83
         51 |        279        2.79       97.62
         52 |         51        0.51       98.13
         53 |          6        0.06       98.19
         55 |          9        0.09       98.28
         99 |        172        1.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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