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

      TOWED |
   TRAILING |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,846       88.46       88.46
          1 |        438        4.38       92.84
          2 |         27        0.27       93.11
          3 |          1        0.01       93.12
          4 |          3        0.03       93.15
          5 |         11        0.11       93.26
          9 |         59        0.59       93.85
          . |        615        6.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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