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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,349       73.49       73.49
          1 |         36        0.36       73.85
          2 |         96        0.96       74.81
          3 |        863        8.63       83.44
          4 |         27        0.27       83.71
          5 |         27        0.27       83.98
          6 |          4        0.04       84.02
          7 |          6        0.06       84.08
          8 |          4        0.04       84.12
          9 |          7        0.07       84.19
         20 |        886        8.86       93.05
         21 |         15        0.15       93.20
         28 |        315        3.15       96.35
         29 |          3        0.03       96.38
         30 |          5        0.05       96.43
         39 |          2        0.02       96.45
         40 |        227        2.27       98.72
         50 |         12        0.12       98.84
         60 |         22        0.22       99.06
         61 |         11        0.11       99.17
         62 |          1        0.01       99.18
         69 |          1        0.01       99.19
         70 |         23        0.23       99.42
         71 |          7        0.07       99.49
         72 |          3        0.03       99.52
         80 |          2        0.02       99.54
         98 |          2        0.02       99.56
         99 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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