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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,700       77.00       77.00
          1 |      1,170       11.70       88.70
          2 |        217        2.17       90.87
          3 |         40        0.40       91.27
          4 |          6        0.06       91.33
          5 |          1        0.01       91.34
          6 |          1        0.01       91.35
         98 |        424        4.24       95.59
         99 |        379        3.79       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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