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

    Vehicle |
 Trailering |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,189       91.89       91.89
          1 |        642        6.42       98.31
          2 |        104        1.04       99.35
          3 |          4        0.04       99.39
          9 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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