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

    vehicle |
   trailing |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,393       93.93       93.93
          1 |        548        5.48       99.41
          2 |         34        0.34       99.75
          4 |          5        0.05       99.80
          5 |          8        0.08       99.88
          6 |          4        0.04       99.92
          9 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016