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

      TOWED |
   TRAILING |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,831       88.31       88.31
          1 |        426        4.26       92.57
          2 |         19        0.19       92.76
          4 |          1        0.01       92.77
          5 |          6        0.06       92.83
          9 |        148        1.48       94.31
          . |        569        5.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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