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

 Crash Time |
   (MINUTE) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        522        5.22        5.22
          1 |        108        1.08        6.30
          2 |        143        1.43        7.73
          3 |        117        1.17        8.90
          4 |         79        0.79        9.69
          5 |        329        3.29       12.98
          6 |         68        0.68       13.66
          7 |         84        0.84       14.50
          8 |        102        1.02       15.52
          9 |        118        1.18       16.70
         10 |        386        3.86       20.56
         11 |         83        0.83       21.39
         12 |        163        1.63       23.02
         13 |        100        1.00       24.02
         14 |        131        1.31       25.33
         15 |        440        4.40       29.73
         16 |         86        0.86       30.59
         17 |        105        1.05       31.64
         18 |        135        1.35       32.99
         19 |        100        1.00       33.99
         20 |        482        4.82       38.81
         21 |         74        0.74       39.55
         22 |         86        0.86       40.41
         23 |        116        1.16       41.57
         24 |         74        0.74       42.31
         25 |        308        3.08       45.39
         26 |        103        1.03       46.42
         27 |        116        1.16       47.58
         28 |        131        1.31       48.89
         29 |         77        0.77       49.66
         30 |        587        5.87       55.53
         31 |         81        0.81       56.34
         32 |        123        1.23       57.57
         33 |        118        1.18       58.75
         34 |         93        0.93       59.68
         35 |        312        3.12       62.80
         36 |         97        0.97       63.77
         37 |         80        0.80       64.57
         38 |        107        1.07       65.64
         39 |         85        0.85       66.49
         40 |        427        4.27       70.76
         41 |         86        0.86       71.62
         42 |         96        0.96       72.58
         43 |        108        1.08       73.66
         44 |         72        0.72       74.38
         45 |        424        4.24       78.62
         46 |         74        0.74       79.36
         47 |        119        1.19       80.55
         48 |        104        1.04       81.59
         49 |        112        1.12       82.71
         50 |        415        4.15       86.86
         51 |         96        0.96       87.82
         52 |        102        1.02       88.84
         53 |        132        1.32       90.16
         54 |        138        1.38       91.54
         55 |        276        2.76       94.30
         56 |        100        1.00       95.30
         57 |        143        1.43       96.73
         58 |        108        1.08       97.81
         59 |         82        0.82       98.63
         99 |        137        1.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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