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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,455       74.55       74.55
          1 |      1,361       13.61       88.16
          2 |        409        4.09       92.25
          3 |        135        1.35       93.60
          4 |         56        0.56       94.16
          5 |         20        0.20       94.36
          6 |          7        0.07       94.43
          7 |          2        0.02       94.45
          8 |          1        0.01       94.46
         10 |          1        0.01       94.47
         11 |          1        0.01       94.48
         99 |        552        5.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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