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

    Vehicle |
   Trailing |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,389       93.89       93.89
          1 |        555        5.55       99.44
          2 |         33        0.33       99.77
          5 |          5        0.05       99.82
          6 |          2        0.02       99.84
          9 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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