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

   previous |
   speeding |
convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,082       80.82       80.82
          1 |      1,143       11.43       92.25
          2 |        270        2.70       94.95
          3 |         76        0.76       95.71
          4 |         23        0.23       95.94
          5 |          3        0.03       95.97
          6 |          3        0.03       96.00
         99 |        339        3.39       99.39
        998 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016