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

    Vehicle |
 Trailering |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,308       93.08       93.08
          1 |        564        5.64       98.72
          2 |         84        0.84       99.56
          3 |          1        0.01       99.57
          4 |          1        0.01       99.58
          9 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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