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

    Seating |
   Position |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        852        8.52        8.52
         11 |      5,343       53.43       61.95
         12 |        264        2.64       64.59
         13 |      1,833       18.33       82.92
         18 |         56        0.56       83.48
         19 |         23        0.23       83.71
         21 |        373        3.73       87.44
         22 |        119        1.19       88.63
         23 |        279        2.79       91.42
         28 |         22        0.22       91.64
         29 |         70        0.70       92.34
         31 |         10        0.10       92.44
         32 |          9        0.09       92.53
         33 |          7        0.07       92.60
         49 |          2        0.02       92.62
         50 |         24        0.24       92.86
         51 |        213        2.13       94.99
         52 |         43        0.43       95.42
         53 |          7        0.07       95.49
         54 |          4        0.04       95.53
         55 |         11        0.11       95.64
         99 |        436        4.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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