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

      TOWED |
   TRAILING |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,579       85.79       85.79
          1 |        485        4.85       90.64
          2 |         37        0.37       91.01
          3 |          2        0.02       91.03
          4 |          3        0.03       91.06
          9 |        151        1.51       92.57
          . |        743        7.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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