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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        695        6.95        6.95
         11 |      5,301       53.01       59.96
         12 |        168        1.68       61.64
         13 |      1,993       19.93       81.57
         18 |         18        0.18       81.75
         19 |          5        0.05       81.80
         21 |        463        4.63       86.43
         22 |        201        2.01       88.44
         23 |        508        5.08       93.52
         28 |         43        0.43       93.95
         29 |         43        0.43       94.38
         31 |         16        0.16       94.54
         32 |          9        0.09       94.63
         33 |         22        0.22       94.85
         39 |          9        0.09       94.94
         50 |         20        0.20       95.14
         51 |        249        2.49       97.63
         52 |         36        0.36       97.99
         53 |         14        0.14       98.13
         54 |          1        0.01       98.14
         55 |         10        0.10       98.24
         99 |        176        1.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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