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 |        540        5.40       99.47
          2 |         31        0.31       99.78
          4 |          1        0.01       99.79
          5 |          5        0.05       99.84
          6 |          8        0.08       99.92
          9 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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