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

   Crash to |
      Death |
    Minutes |
  (Minutes) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,666       16.66       16.66
          1 |         36        0.36       17.02
          2 |         40        0.40       17.42
          3 |         32        0.32       17.74
          4 |         34        0.34       18.08
          5 |         60        0.60       18.68
          6 |         30        0.30       18.98
          7 |         32        0.32       19.30
          8 |         37        0.37       19.67
          9 |         25        0.25       19.92
         10 |         63        0.63       20.55
         11 |         26        0.26       20.81
         12 |         33        0.33       21.14
         13 |         38        0.38       21.52
         14 |         30        0.30       21.82
         15 |         42        0.42       22.24
         16 |         33        0.33       22.57
         17 |         24        0.24       22.81
         18 |         40        0.40       23.21
         19 |         35        0.35       23.56
         20 |         59        0.59       24.15
         21 |         29        0.29       24.44
         22 |         31        0.31       24.75
         23 |         35        0.35       25.10
         24 |         25        0.25       25.35
         25 |         55        0.55       25.90
         26 |         34        0.34       26.24
         27 |         34        0.34       26.58
         28 |         40        0.40       26.98
         29 |         32        0.32       27.30
         30 |         54        0.54       27.84
         31 |         27        0.27       28.11
         32 |         36        0.36       28.47
         33 |         23        0.23       28.70
         34 |         25        0.25       28.95
         35 |         67        0.67       29.62
         36 |         27        0.27       29.89
         37 |         28        0.28       30.17
         38 |         34        0.34       30.51
         39 |         31        0.31       30.82
         40 |         51        0.51       31.33
         41 |         35        0.35       31.68
         42 |         39        0.39       32.07
         43 |         38        0.38       32.45
         44 |         35        0.35       32.80
         45 |         58        0.58       33.38
         46 |         38        0.38       33.76
         47 |         31        0.31       34.07
         48 |         29        0.29       34.36
         49 |         24        0.24       34.60
         50 |         53        0.53       35.13
         51 |         28        0.28       35.41
         52 |         33        0.33       35.74
         53 |         20        0.20       35.94
         54 |         33        0.33       36.27
         55 |         43        0.43       36.70
         56 |         23        0.23       36.93
         57 |         25        0.25       37.18
         58 |         25        0.25       37.43
         59 |         18        0.18       37.61
         99 |      6,239       62.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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