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

      TOWED |
   TRAILING |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,727       87.27       87.27
          1 |        502        5.02       92.29
          2 |         18        0.18       92.47
          3 |          1        0.01       92.48
          4 |          2        0.02       92.50
          9 |         68        0.68       93.18
          . |        682        6.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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