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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,939       79.39       79.39
          1 |      1,261       12.61       92.00
          2 |        232        2.32       94.32
          3 |         42        0.42       94.74
          4 |          9        0.09       94.83
          5 |          1        0.01       94.84
         98 |         55        0.55       95.39
         99 |        389        3.89       99.28
          . |         72        0.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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