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

   Crash to |
      Death |
    Minutes |
  (Minutes) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,505       15.05       15.05
          1 |         26        0.26       15.31
          2 |         27        0.27       15.58
          3 |         26        0.26       15.84
          4 |         35        0.35       16.19
          5 |         61        0.61       16.80
          6 |         26        0.26       17.06
          7 |         32        0.32       17.38
          8 |         46        0.46       17.84
          9 |         38        0.38       18.22
         10 |         55        0.55       18.77
         11 |         38        0.38       19.15
         12 |         35        0.35       19.50
         13 |         36        0.36       19.86
         14 |         45        0.45       20.31
         15 |         60        0.60       20.91
         16 |         19        0.19       21.10
         17 |         36        0.36       21.46
         18 |         34        0.34       21.80
         19 |         36        0.36       22.16
         20 |         53        0.53       22.69
         21 |         33        0.33       23.02
         22 |         28        0.28       23.30
         23 |         40        0.40       23.70
         24 |         33        0.33       24.03
         25 |         52        0.52       24.55
         26 |         40        0.40       24.95
         27 |         42        0.42       25.37
         28 |         33        0.33       25.70
         29 |         36        0.36       26.06
         30 |         77        0.77       26.83
         31 |         31        0.31       27.14
         32 |         40        0.40       27.54
         33 |         34        0.34       27.88
         34 |         36        0.36       28.24
         35 |         58        0.58       28.82
         36 |         26        0.26       29.08
         37 |         20        0.20       29.28
         38 |         33        0.33       29.61
         39 |         37        0.37       29.98
         40 |         56        0.56       30.54
         41 |         30        0.30       30.84
         42 |         36        0.36       31.20
         43 |         31        0.31       31.51
         44 |         33        0.33       31.84
         45 |         55        0.55       32.39
         46 |         29        0.29       32.68
         47 |         33        0.33       33.01
         48 |         25        0.25       33.26
         49 |         24        0.24       33.50
         50 |         58        0.58       34.08
         51 |         29        0.29       34.37
         52 |         28        0.28       34.65
         53 |         27        0.27       34.92
         54 |         28        0.28       35.20
         55 |         56        0.56       35.76
         56 |         27        0.27       36.03
         57 |         29        0.29       36.32
         58 |         21        0.21       36.53
         59 |         24        0.24       36.77
         99 |      6,323       63.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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