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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,589       75.89       75.89
          1 |      1,295       12.95       88.84
          2 |        349        3.49       92.33
          3 |        116        1.16       93.49
          4 |         32        0.32       93.81
          5 |         11        0.11       93.92
          6 |          3        0.03       93.95
          7 |          3        0.03       93.98
          9 |          1        0.01       93.99
         10 |          1        0.01       94.00
         99 |        553        5.53       99.53
          . |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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