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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,864       78.64       78.64
          1 |      1,176       11.76       90.40
          2 |        211        2.11       92.51
          3 |         46        0.46       92.97
          4 |          6        0.06       93.03
          5 |          4        0.04       93.07
          6 |          1        0.01       93.08
          7 |          1        0.01       93.09
          8 |          1        0.01       93.10
         98 |         90        0.90       94.00
         99 |        553        5.53       99.53
          . |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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