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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        563        5.63        5.63
          1 |        369        3.69        9.32
          2 |        123        1.23       10.55
          3 |        585        5.85       16.40
          4 |         72        0.72       17.12
          5 |        119        1.19       18.31
          6 |        476        4.76       23.07
          7 |        123        1.23       24.30
          8 |         88        0.88       25.18
          9 |        740        7.40       32.58
         10 |        167        1.67       34.25
         11 |        493        4.93       39.18
         12 |      5,156       51.56       90.74
         13 |        164        1.64       92.38
         14 |        211        2.11       94.49
         18 |        133        1.33       95.82
         99 |        418        4.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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