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

    Vehicle |
       Role |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,031       10.31       10.31
          1 |      6,265       62.65       72.96
          2 |      1,581       15.81       88.77
          3 |        227        2.27       91.04
          9 |         31        0.31       91.35
          . |        865        8.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016