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

      TOWED |
   TRAILING |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,803       88.03       88.03
          1 |        447        4.47       92.50
          2 |         23        0.23       92.73
          4 |          1        0.01       92.74
          5 |          2        0.02       92.76
          9 |        102        1.02       93.78
          . |        622        6.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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