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

Notificatio |
 n Time EMS |
     (HOUR) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        196        1.96        1.96
          1 |        216        2.16        4.12
          2 |        229        2.29        6.41
          3 |        179        1.79        8.20
          4 |        129        1.29        9.49
          5 |        157        1.57       11.06
          6 |        188        1.88       12.94
          7 |        192        1.92       14.86
          8 |        165        1.65       16.51
          9 |        156        1.56       18.07
         10 |        189        1.89       19.96
         11 |        207        2.07       22.03
         12 |        198        1.98       24.01
         13 |        233        2.33       26.34
         14 |        237        2.37       28.71
         15 |        235        2.35       31.06
         16 |        288        2.88       33.94
         17 |        250        2.50       36.44
         18 |        335        3.35       39.79
         19 |        324        3.24       43.03
         20 |        290        2.90       45.93
         21 |        283        2.83       48.76
         22 |        250        2.50       51.26
         23 |        219        2.19       53.45
         88 |        373        3.73       57.18
         99 |      4,282       42.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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