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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,197       71.97       71.97
          1 |      1,589       15.89       87.86
          2 |        365        3.65       91.51
          3 |         74        0.74       92.25
          4 |         19        0.19       92.44
          5 |          9        0.09       92.53
          6 |          1        0.01       92.54
         99 |        746        7.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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