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

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        638        6.38        6.38
          1 |        995        9.95       16.33
          2 |        175        1.75       18.08
          3 |        627        6.27       24.35
          4 |         87        0.87       25.22
          5 |        131        1.31       26.53
          6 |        392        3.92       30.45
          7 |        145        1.45       31.90
          8 |        110        1.10       33.00
          9 |        627        6.27       39.27
         10 |        193        1.93       41.20
         11 |      1,021       10.21       51.41
         12 |      4,304       43.04       94.45
         13 |         31        0.31       94.76
         14 |        439        4.39       99.15
         15 |          4        0.04       99.19
         16 |          1        0.01       99.20
         99 |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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