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

      TOWED |
   TRAILING |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,802       88.02       88.02
          1 |        444        4.44       92.46
          2 |         36        0.36       92.82
          4 |          1        0.01       92.83
          5 |         10        0.10       92.93
          9 |         42        0.42       93.35
          . |        665        6.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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