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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,046       70.46       70.46
          1 |         26        0.26       70.72
          2 |        214        2.14       72.86
          3 |        698        6.98       79.84
          4 |         10        0.10       79.94
          5 |         12        0.12       80.06
          6 |          1        0.01       80.07
          7 |          1        0.01       80.08
          8 |          4        0.04       80.12
          9 |         11        0.11       80.23
         20 |        784        7.84       88.07
         21 |         11        0.11       88.18
         28 |        924        9.24       97.42
         29 |          6        0.06       97.48
         38 |          2        0.02       97.50
         39 |          1        0.01       97.51
         40 |        138        1.38       98.89
         41 |          5        0.05       98.94
         50 |          8        0.08       99.02
         60 |         16        0.16       99.18
         61 |          4        0.04       99.22
         68 |          1        0.01       99.23
         69 |          1        0.01       99.24
         70 |          8        0.08       99.32
         71 |          4        0.04       99.36
         72 |          3        0.03       99.39
         80 |          2        0.02       99.41
         98 |         41        0.41       99.82
         99 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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