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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,430       64.30       64.30
          1 |      1,897       18.97       83.27
          2 |        631        6.31       89.58
          3 |        190        1.90       91.48
          4 |         66        0.66       92.14
          5 |         24        0.24       92.38
          6 |         10        0.10       92.48
          7 |          7        0.07       92.55
          8 |          1        0.01       92.56
          9 |          2        0.02       92.58
         80 |          1        0.01       92.59
         99 |        741        7.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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