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

    Vehicle |
 Trailering |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,311       93.11       93.11
          1 |        555        5.55       98.66
          2 |         91        0.91       99.57
          3 |          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