Frequencies for first 10,000 rows of tra_cont variable in accident dataset :

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,579       65.79       65.79
          1 |         19        0.19       65.98
          2 |         72        0.72       66.70
          3 |        757        7.57       74.27
          4 |         58        0.58       74.85
          5 |         19        0.19       75.04
          6 |          8        0.08       75.12
          7 |          1        0.01       75.13
          8 |          8        0.08       75.21
          9 |          6        0.06       75.27
         20 |        960        9.60       84.87
         21 |         15        0.15       85.02
         28 |         89        0.89       85.91
         29 |          2        0.02       85.93
         30 |          3        0.03       85.96
         31 |          1        0.01       85.97
         38 |          1        0.01       85.98
         40 |      1,287       12.87       98.85
         50 |         15        0.15       99.00
         60 |         23        0.23       99.23
         61 |         13        0.13       99.36
         62 |          6        0.06       99.42
         63 |          1        0.01       99.43
         69 |          1        0.01       99.44
         70 |         21        0.21       99.65
         71 |          8        0.08       99.73
         72 |          3        0.03       99.76
         80 |          3        0.03       99.79
         98 |          3        0.03       99.82
         99 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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