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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,614       76.14       76.14
          1 |      1,319       13.19       89.33
          2 |        361        3.61       92.94
          3 |        103        1.03       93.97
          4 |         33        0.33       94.30
          5 |         17        0.17       94.47
          6 |          4        0.04       94.51
          7 |          1        0.01       94.52
          9 |          1        0.01       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