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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        622        6.22        6.22
         11 |      5,597       55.97       62.19
         12 |         68        0.68       62.87
         13 |      1,769       17.69       80.56
         19 |          1        0.01       80.57
         21 |        512        5.12       85.69
         22 |        232        2.32       88.01
         23 |        533        5.33       93.34
         28 |          2        0.02       93.36
         29 |         23        0.23       93.59
         31 |         39        0.39       93.98
         32 |         27        0.27       94.25
         33 |         33        0.33       94.58
         39 |          4        0.04       94.62
         50 |         16        0.16       94.78
         51 |        150        1.50       96.28
         52 |         22        0.22       96.50
         53 |         10        0.10       96.60
         54 |          1        0.01       96.61
         55 |         12        0.12       96.73
         99 |        327        3.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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