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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,908       79.08       79.08
          1 |      1,200       12.00       91.08
          2 |        213        2.13       93.21
          3 |         38        0.38       93.59
          4 |          4        0.04       93.63
          5 |          4        0.04       93.67
          6 |          2        0.02       93.69
         98 |         82        0.82       94.51
         99 |        468        4.68       99.19
          . |         81        0.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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