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

   Previous |
   speeding |
convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
         -1 |         15        0.15        0.15
          0 |      7,760       77.60       77.75
          1 |      1,262       12.62       90.37
          2 |        364        3.64       94.01
          3 |        113        1.13       95.14
          4 |         31        0.31       95.45
          5 |         16        0.16       95.61
          7 |          4        0.04       95.65
          8 |          1        0.01       95.66
         99 |        387        3.87       99.53
          . |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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