Frequencies for first 10,000 rows of impact2 variable in vehicle dataset :

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        571        5.71        5.71
          1 |        305        3.05        8.76
          2 |        105        1.05        9.81
          3 |        550        5.50       15.31
          4 |         85        0.85       16.16
          5 |         99        0.99       17.15
          6 |        602        6.02       23.17
          7 |        118        1.18       24.35
          8 |         74        0.74       25.09
          9 |        744        7.44       32.53
         10 |        158        1.58       34.11
         11 |        406        4.06       38.17
         12 |      5,120       51.20       89.37
         13 |        226        2.26       91.63
         14 |        222        2.22       93.85
         18 |         65        0.65       94.50
         99 |        550        5.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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