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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,884       78.84       78.84
          1 |      1,274       12.74       91.58
          2 |        204        2.04       93.62
          3 |         39        0.39       94.01
          4 |          6        0.06       94.07
          5 |          2        0.02       94.09
         98 |         69        0.69       94.78
         99 |        470        4.70       99.48
          . |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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