Frequencies for first 10,000 rows of impact1 variable in vehicle dataset :

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        766        7.66        7.66
          1 |      1,143       11.43       19.09
          2 |        146        1.46       20.55
          3 |        567        5.67       26.22
          4 |         43        0.43       26.65
          5 |        115        1.15       27.80
          6 |        375        3.75       31.55
          7 |        156        1.56       33.11
          8 |         99        0.99       34.10
          9 |        544        5.44       39.54
         10 |        175        1.75       41.29
         11 |      1,149       11.49       52.78
         12 |      4,186       41.86       94.64
         13 |         29        0.29       94.93
         14 |        414        4.14       99.07
         15 |          6        0.06       99.13
         99 |         87        0.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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