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

    Vehicle |
 Trailering |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,705       87.05       87.05
          1 |        470        4.70       91.75
          2 |         32        0.32       92.07
          3 |          1        0.01       92.08
          9 |         46        0.46       92.54
          . |        746        7.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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