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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        834        8.34        8.34
         11 |      5,247       52.47       60.81
         12 |        170        1.70       62.51
         13 |      1,999       19.99       82.50
         18 |         17        0.17       82.67
         19 |          9        0.09       82.76
         21 |        466        4.66       87.42
         22 |        212        2.12       89.54
         23 |        502        5.02       94.56
         28 |         19        0.19       94.75
         29 |         35        0.35       95.10
         31 |         18        0.18       95.28
         32 |         12        0.12       95.40
         33 |         17        0.17       95.57
         38 |          1        0.01       95.58
         50 |         30        0.30       95.88
         51 |        204        2.04       97.92
         52 |         59        0.59       98.51
         53 |         12        0.12       98.63
         54 |          6        0.06       98.69
         55 |          8        0.08       98.77
         99 |        123        1.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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