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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,570       75.70       75.70
          1 |      1,441       14.41       90.11
          2 |        270        2.70       92.81
          3 |         36        0.36       93.17
          4 |          7        0.07       93.24
          5 |          1        0.01       93.25
         99 |        675        6.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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