Frequencies for impact2 variable in vehicle dataset :

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         14        2.97        2.97
          1 |         27        5.72        8.69
          2 |         17        3.60       12.29
          3 |         35        7.42       19.70
          5 |          7        1.48       21.19
          6 |         26        5.51       26.69
          7 |          4        0.85       27.54
          9 |         40        8.47       36.02
         10 |         10        2.12       38.14
         11 |         23        4.87       43.01
         12 |        252       53.39       96.40
         13 |         17        3.60      100.00
------------+-----------------------------------
      Total |        472      100.00

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