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

notificatio |
 n time ems |
     (hour) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        128        1.28        1.28
          1 |        112        1.12        2.40
          2 |        115        1.15        3.55
          3 |         91        0.91        4.46
          4 |         70        0.70        5.16
          5 |         81        0.81        5.97
          6 |        110        1.10        7.07
          7 |        125        1.25        8.32
          8 |        102        1.02        9.34
          9 |         99        0.99       10.33
         10 |        113        1.13       11.46
         11 |        129        1.29       12.75
         12 |        152        1.52       14.27
         13 |        150        1.50       15.77
         14 |        151        1.51       17.28
         15 |        198        1.98       19.26
         16 |        171        1.71       20.97
         17 |        154        1.54       22.51
         18 |        195        1.95       24.46
         19 |        181        1.81       26.27
         20 |        177        1.77       28.04
         21 |        157        1.57       29.61
         22 |        168        1.68       31.29
         23 |        144        1.44       32.73
         88 |        185        1.85       34.58
         99 |      6,542       65.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016