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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        615        6.15        6.15
         11 |      5,684       56.84       62.99
         12 |         63        0.63       63.62
         13 |      1,733       17.33       80.95
         18 |          1        0.01       80.96
         19 |          4        0.04       81.00
         21 |        496        4.96       85.96
         22 |        244        2.44       88.40
         23 |        586        5.86       94.26
         28 |          4        0.04       94.30
         29 |          7        0.07       94.37
         31 |         34        0.34       94.71
         32 |         28        0.28       94.99
         33 |         27        0.27       95.26
         39 |          3        0.03       95.29
         50 |         13        0.13       95.42
         51 |        227        2.27       97.69
         52 |         20        0.20       97.89
         53 |          5        0.05       97.94
         55 |          5        0.05       97.99
         99 |        201        2.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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