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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,720       77.20       77.20
          1 |      1,244       12.44       89.64
          2 |        374        3.74       93.38
          3 |        139        1.39       94.77
          4 |         40        0.40       95.17
          5 |         14        0.14       95.31
          6 |          3        0.03       95.34
          7 |          1        0.01       95.35
          9 |          3        0.03       95.38
         10 |          1        0.01       95.39
         13 |          1        0.01       95.40
         99 |        408        4.08       99.48
          . |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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