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

    Vehicle |
       Role |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,137       11.37       11.37
          1 |      6,094       60.94       72.31
          2 |      1,696       16.96       89.27
          3 |        245        2.45       91.72
          9 |          7        0.07       91.79
          . |        821        8.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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