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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,913       79.13       79.13
          1 |      1,302       13.02       92.15
          2 |        203        2.03       94.18
          3 |         33        0.33       94.51
          4 |          8        0.08       94.59
          5 |          5        0.05       94.64
         98 |         76        0.76       95.40
         99 |        408        4.08       99.48
          . |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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