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

    Vehicle |
   Trailing |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,664       86.64       86.64
          1 |        424        4.24       90.88
          2 |         26        0.26       91.14
          5 |          9        0.09       91.23
          9 |          7        0.07       91.30
          . |        870        8.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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