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

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,643       76.43       76.43
          1 |      1,431       14.31       90.74
          2 |        282        2.82       93.56
          3 |         35        0.35       93.91
          4 |          8        0.08       93.99
          5 |          3        0.03       94.02
          6 |          1        0.01       94.03
         99 |        597        5.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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