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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,395       73.95       73.95
          1 |      1,457       14.57       88.52
          2 |        313        3.13       91.65
          3 |         73        0.73       92.38
          4 |         18        0.18       92.56
          5 |          4        0.04       92.60
         99 |        740        7.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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