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

     minute |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        539        5.39        5.39
          1 |        104        1.04        6.43
          2 |        103        1.03        7.46
          3 |         87        0.87        8.33
          4 |        123        1.23        9.56
          5 |        324        3.24       12.80
          6 |         92        0.92       13.72
          7 |        121        1.21       14.93
          8 |        138        1.38       16.31
          9 |        103        1.03       17.34
         10 |        369        3.69       21.03
         11 |         96        0.96       21.99
         12 |        122        1.22       23.21
         13 |        101        1.01       24.22
         14 |        112        1.12       25.34
         15 |        405        4.05       29.39
         16 |        104        1.04       30.43
         17 |        113        1.13       31.56
         18 |        113        1.13       32.69
         19 |        127        1.27       33.96
         20 |        386        3.86       37.82
         21 |         89        0.89       38.71
         22 |        110        1.10       39.81
         23 |        108        1.08       40.89
         24 |        110        1.10       41.99
         25 |        312        3.12       45.11
         26 |        116        1.16       46.27
         27 |        121        1.21       47.48
         28 |        124        1.24       48.72
         29 |         95        0.95       49.67
         30 |        545        5.45       55.12
         31 |         87        0.87       55.99
         32 |        111        1.11       57.10
         33 |        119        1.19       58.29
         34 |         96        0.96       59.25
         35 |        325        3.25       62.50
         36 |         97        0.97       63.47
         37 |        118        1.18       64.65
         38 |        127        1.27       65.92
         39 |        107        1.07       66.99
         40 |        355        3.55       70.54
         41 |         81        0.81       71.35
         42 |        110        1.10       72.45
         43 |        115        1.15       73.60
         44 |        109        1.09       74.69
         45 |        387        3.87       78.56
         46 |        111        1.11       79.67
         47 |        106        1.06       80.73
         48 |        118        1.18       81.91
         49 |        105        1.05       82.96
         50 |        390        3.90       86.86
         51 |         95        0.95       87.81
         52 |        121        1.21       89.02
         53 |        108        1.08       90.10
         54 |         95        0.95       91.05
         55 |        319        3.19       94.24
         56 |        111        1.11       95.35
         57 |        103        1.03       96.38
         58 |        115        1.15       97.53
         59 |        117        1.17       98.70
         99 |        130        1.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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