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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,776       77.76       77.76
          1 |      1,249       12.49       90.25
          2 |        214        2.14       92.39
          3 |         39        0.39       92.78
          4 |          2        0.02       92.80
          5 |          2        0.02       92.82
          6 |          2        0.02       92.84
          8 |          1        0.01       92.85
         98 |         79        0.79       93.64
         99 |        571        5.71       99.35
          . |         65        0.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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