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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,905       79.05       79.05
          1 |      1,326       13.26       92.31
          2 |        211        2.11       94.42
          3 |         39        0.39       94.81
          4 |          6        0.06       94.87
         98 |         33        0.33       95.20
         99 |        417        4.17       99.37
          . |         63        0.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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