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

    Vehicle |
   Trailing |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,407       94.07       94.07
          1 |        526        5.26       99.33
          2 |         28        0.28       99.61
          5 |          6        0.06       99.67
          6 |          1        0.01       99.68
          9 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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