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

 crash time |
   (minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        506        5.06        5.06
          1 |        114        1.14        6.20
          2 |        118        1.18        7.38
          3 |        117        1.17        8.55
          4 |        104        1.04        9.59
          5 |        299        2.99       12.58
          6 |        107        1.07       13.65
          7 |        125        1.25       14.90
          8 |        111        1.11       16.01
          9 |        117        1.17       17.18
         10 |        327        3.27       20.45
         11 |        125        1.25       21.70
         12 |        143        1.43       23.13
         13 |         98        0.98       24.11
         14 |        130        1.30       25.41
         15 |        375        3.75       29.16
         16 |        101        1.01       30.17
         17 |        108        1.08       31.25
         18 |        144        1.44       32.69
         19 |        111        1.11       33.80
         20 |        381        3.81       37.61
         21 |         92        0.92       38.53
         22 |        128        1.28       39.81
         23 |        121        1.21       41.02
         24 |        117        1.17       42.19
         25 |        321        3.21       45.40
         26 |         98        0.98       46.38
         27 |        121        1.21       47.59
         28 |        141        1.41       49.00
         29 |         94        0.94       49.94
         30 |        509        5.09       55.03
         31 |         97        0.97       56.00
         32 |        123        1.23       57.23
         33 |        115        1.15       58.38
         34 |        105        1.05       59.43
         35 |        305        3.05       62.48
         36 |         93        0.93       63.41
         37 |        107        1.07       64.48
         38 |        131        1.31       65.79
         39 |        105        1.05       66.84
         40 |        360        3.60       70.44
         41 |        100        1.00       71.44
         42 |        124        1.24       72.68
         43 |        110        1.10       73.78
         44 |        100        1.00       74.78
         45 |        397        3.97       78.75
         46 |        111        1.11       79.86
         47 |        113        1.13       80.99
         48 |        118        1.18       82.17
         49 |        109        1.09       83.26
         50 |        383        3.83       87.09
         51 |         92        0.92       88.01
         52 |        108        1.08       89.09
         53 |        136        1.36       90.45
         54 |        103        1.03       91.48
         55 |        312        3.12       94.60
         56 |        105        1.05       95.65
         57 |        123        1.23       96.88
         58 |        140        1.40       98.28
         59 |         90        0.90       99.18
         99 |         82        0.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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