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

   Previous |
   speeding |
convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,763       77.63       77.63
          1 |      1,269       12.69       90.32
          2 |        355        3.55       93.87
          3 |        103        1.03       94.90
          4 |         29        0.29       95.19
          5 |         13        0.13       95.32
          6 |          1        0.01       95.33
          7 |          1        0.01       95.34
         99 |        405        4.05       99.39
        998 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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