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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        521        5.21        5.21
          1 |        256        2.56        7.77
          2 |        231        2.31       10.08
          3 |        160        1.60       11.68
          4 |        132        1.32       13.00
          5 |        131        1.31       14.31
          6 |        187        1.87       16.18
          7 |        198        1.98       18.16
          8 |        169        1.69       19.85
          9 |        154        1.54       21.39
         10 |        177        1.77       23.16
         11 |        185        1.85       25.01
         12 |        197        1.97       26.98
         13 |        209        2.09       29.07
         14 |        259        2.59       31.66
         15 |        268        2.68       34.34
         16 |        292        2.92       37.26
         17 |        265        2.65       39.91
         18 |        319        3.19       43.10
         19 |        305        3.05       46.15
         20 |        300        3.00       49.15
         21 |        292        2.92       52.07
         22 |        265        2.65       54.72
         23 |        269        2.69       57.41
         24 |          4        0.04       57.45
         99 |      4,255       42.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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