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

      TOWED |
   TRAILING |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,751       87.51       87.51
          1 |        466        4.66       92.17
          2 |         19        0.19       92.36
          4 |          1        0.01       92.37
          5 |          6        0.06       92.43
          9 |        129        1.29       93.72
          . |        628        6.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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