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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        447        4.47        4.47
          1 |        220        2.20        6.67
          2 |        247        2.47        9.14
          3 |        187        1.87       11.01
          4 |        133        1.33       12.34
          5 |        149        1.49       13.83
          6 |        207        2.07       15.90
          7 |        181        1.81       17.71
          8 |        163        1.63       19.34
          9 |        165        1.65       20.99
         10 |        179        1.79       22.78
         11 |        184        1.84       24.62
         12 |        196        1.96       26.58
         13 |        202        2.02       28.60
         14 |        248        2.48       31.08
         15 |        250        2.50       33.58
         16 |        291        2.91       36.49
         17 |        280        2.80       39.29
         18 |        312        3.12       42.41
         19 |        319        3.19       45.60
         20 |        333        3.33       48.93
         21 |        321        3.21       52.14
         22 |        265        2.65       54.79
         23 |        278        2.78       57.57
         24 |          2        0.02       57.59
         99 |      4,241       42.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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