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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,613       76.13       76.13
          1 |      1,283       12.83       88.96
          2 |        238        2.38       91.34
          3 |         48        0.48       91.82
          4 |         13        0.13       91.95
          5 |          1        0.01       91.96
         99 |        804        8.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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