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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,453       74.53       74.53
          1 |      1,487       14.87       89.40
          2 |        302        3.02       92.42
          3 |         59        0.59       93.01
          4 |          9        0.09       93.10
          5 |          6        0.06       93.16
         99 |        684        6.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016