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

    SEATING |
   POSITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        631        6.31        6.31
         11 |      5,505       55.05       61.36
         12 |         99        0.99       62.35
         13 |      1,803       18.03       80.38
         19 |         13        0.13       80.51
         21 |        493        4.93       85.44
         22 |        230        2.30       87.74
         23 |        517        5.17       92.91
         28 |         20        0.20       93.11
         29 |         37        0.37       93.48
         31 |         33        0.33       93.81
         32 |         17        0.17       93.98
         33 |         26        0.26       94.24
         38 |          6        0.06       94.30
         39 |          6        0.06       94.36
         41 |          2        0.02       94.38
         42 |          1        0.01       94.39
         43 |          1        0.01       94.40
         50 |          9        0.09       94.49
         51 |        198        1.98       96.47
         52 |         39        0.39       96.86
         53 |          5        0.05       96.91
         54 |          1        0.01       96.92
         55 |         24        0.24       97.16
         99 |        284        2.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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