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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,329       73.29       73.29
          1 |      1,423       14.23       87.52
          2 |        367        3.67       91.19
          3 |         58        0.58       91.77
          4 |         18        0.18       91.95
          5 |          4        0.04       91.99
         99 |        801        8.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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