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

    VEHICLE |
       ROLE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        826        8.26        8.26
          1 |      6,186       61.86       70.12
          2 |      1,848       18.48       88.60
          3 |        365        3.65       92.25
          9 |         80        0.80       93.05
          . |        695        6.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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