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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,228       72.28       72.28
          1 |      1,441       14.41       86.69
          2 |        335        3.35       90.04
          3 |         74        0.74       90.78
          4 |         15        0.15       90.93
          5 |          7        0.07       91.00
         99 |        900        9.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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