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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        337        3.37        3.37
          1 |        210        2.10        5.47
          2 |        250        2.50        7.97
          3 |        164        1.64        9.61
          4 |        119        1.19       10.80
          5 |        143        1.43       12.23
          6 |        207        2.07       14.30
          7 |        175        1.75       16.05
          8 |        134        1.34       17.39
          9 |        132        1.32       18.71
         10 |        138        1.38       20.09
         11 |        170        1.70       21.79
         12 |        199        1.99       23.78
         13 |        170        1.70       25.48
         14 |        221        2.21       27.69
         15 |        240        2.40       30.09
         16 |        239        2.39       32.48
         17 |        246        2.46       34.94
         18 |        293        2.93       37.87
         19 |        283        2.83       40.70
         20 |        287        2.87       43.57
         21 |        261        2.61       46.18
         22 |        256        2.56       48.74
         23 |        228        2.28       51.02
         24 |          2        0.02       51.04
         99 |      4,896       48.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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