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

   PREVIOUS |
  ACCIDENTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,867       78.67       78.67
          1 |      1,296       12.96       91.63
          2 |        210        2.10       93.73
          3 |         44        0.44       94.17
          4 |          6        0.06       94.23
          7 |          1        0.01       94.24
         10 |          1        0.01       94.25
         98 |         28        0.28       94.53
         99 |        485        4.85       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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