Frequencies for first 10,000 rows of pcrash5 variable in vehicle dataset :

pre- impact |
   location |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         61        0.61        0.61
          1 |      5,797       57.97       58.58
          2 |      1,006       10.06       68.64
          3 |        111        1.11       69.75
          4 |      2,684       26.84       96.59
          5 |         50        0.50       97.09
          6 |        121        1.21       98.30
          7 |         39        0.39       98.69
          9 |        131        1.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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