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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        649        6.49        6.49
         11 |      5,397       53.97       60.46
         12 |         95        0.95       61.41
         13 |      1,901       19.01       80.42
         18 |          5        0.05       80.47
         19 |         17        0.17       80.64
         21 |        517        5.17       85.81
         22 |        218        2.18       87.99
         23 |        525        5.25       93.24
         28 |         16        0.16       93.40
         29 |         19        0.19       93.59
         31 |         29        0.29       93.88
         32 |         17        0.17       94.05
         33 |         31        0.31       94.36
         39 |          1        0.01       94.37
         41 |          1        0.01       94.38
         42 |          1        0.01       94.39
         43 |          1        0.01       94.40
         50 |         22        0.22       94.62
         51 |        188        1.88       96.50
         52 |          7        0.07       96.57
         53 |          8        0.08       96.65
         54 |          5        0.05       96.70
         55 |         21        0.21       96.91
         99 |        309        3.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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