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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,622       76.22       76.22
          1 |      1,201       12.01       88.23
          2 |        172        1.72       89.95
          3 |         32        0.32       90.27
          4 |          5        0.05       90.32
          5 |          3        0.03       90.35
         99 |        965        9.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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