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

    Vehicle |
 Trailering |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,544       85.44       85.44
          1 |        564        5.64       91.08
          2 |         43        0.43       91.51
          3 |          3        0.03       91.54
          9 |         48        0.48       92.02
          . |        798        7.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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