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

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        799        7.99        7.99
          1 |      1,002       10.02       18.01
          2 |        111        1.11       19.12
          3 |        614        6.14       25.26
          4 |         49        0.49       25.75
          5 |        127        1.27       27.02
          6 |        342        3.42       30.44
          7 |        161        1.61       32.05
          8 |         93        0.93       32.98
          9 |        630        6.30       39.28
         10 |        117        1.17       40.45
         11 |        994        9.94       50.39
         12 |      4,529       45.29       95.68
         13 |         16        0.16       95.84
         14 |        367        3.67       99.51
         15 |          5        0.05       99.56
         99 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016