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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,756       77.56       77.56
          1 |      1,204       12.04       89.60
          2 |        285        2.85       92.45
          3 |         79        0.79       93.24
          4 |         30        0.30       93.54
          5 |          7        0.07       93.61
          6 |          2        0.02       93.63
          7 |          1        0.01       93.64
         99 |        571        5.71       99.35
          . |         65        0.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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