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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        471        4.71        4.71
          1 |        308        3.08        7.79
          2 |        136        1.36        9.15
          3 |        548        5.48       14.63
          4 |        102        1.02       15.65
          5 |         80        0.80       16.45
          6 |        502        5.02       21.47
          7 |        102        1.02       22.49
          8 |        102        1.02       23.51
          9 |        637        6.37       29.88
         10 |        164        1.64       31.52
         11 |        407        4.07       35.59
         12 |      5,402       54.02       89.61
         13 |        185        1.85       91.46
         14 |        239        2.39       93.85
         18 |         54        0.54       94.39
         99 |        561        5.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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