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

    Vehicle |
 Trailering |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,640       86.40       86.40
          1 |        508        5.08       91.48
          2 |         38        0.38       91.86
          4 |          1        0.01       91.87
          9 |         37        0.37       92.24
          . |        776        7.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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