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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        445        4.45        4.45
          1 |        227        2.27        6.72
          2 |        207        2.07        8.79
          3 |        165        1.65       10.44
          4 |        128        1.28       11.72
          5 |        117        1.17       12.89
          6 |        213        2.13       15.02
          7 |        231        2.31       17.33
          8 |        186        1.86       19.19
          9 |        161        1.61       20.80
         10 |        176        1.76       22.56
         11 |        190        1.90       24.46
         12 |        216        2.16       26.62
         13 |        246        2.46       29.08
         14 |        285        2.85       31.93
         15 |        319        3.19       35.12
         16 |        300        3.00       38.12
         17 |        260        2.60       40.72
         18 |        369        3.69       44.41
         19 |        317        3.17       47.58
         20 |        296        2.96       50.54
         21 |        312        3.12       53.66
         22 |        269        2.69       56.35
         23 |        261        2.61       58.96
         24 |          5        0.05       59.01
         99 |      4,099       40.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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