Frequencies for first 10,000 rows of first_yr variable in vehicle dataset :

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,065       30.65       30.65
          9 |          1        0.01       30.66
         15 |          1        0.01       30.67
         19 |          1        0.01       30.68
         20 |          1        0.01       30.69
         23 |          2        0.02       30.71
         36 |          1        0.01       30.72
         40 |          1        0.01       30.73
         42 |          2        0.02       30.75
         44 |          2        0.02       30.77
         45 |          3        0.03       30.80
         46 |          3        0.03       30.83
         47 |          1        0.01       30.84
         48 |          2        0.02       30.86
         49 |          7        0.07       30.93
         50 |          4        0.04       30.97
         51 |          7        0.07       31.04
         52 |         17        0.17       31.21
         53 |         14        0.14       31.35
         54 |          7        0.07       31.42
         55 |          7        0.07       31.49
         56 |          8        0.08       31.57
         57 |         23        0.23       31.80
         58 |         17        0.17       31.97
         59 |         20        0.20       32.17
         60 |         30        0.30       32.47
         61 |         28        0.28       32.75
         62 |         28        0.28       33.03
         63 |         36        0.36       33.39
         64 |         64        0.64       34.03
         65 |         89        0.89       34.92
         66 |        116        1.16       36.08
         67 |        158        1.58       37.66
         68 |        222        2.22       39.88
         69 |        635        6.35       46.23
         70 |        967        9.67       55.90
         71 |        888        8.88       64.78
         72 |        829        8.29       73.07
         73 |        791        7.91       80.98
         74 |        833        8.33       89.31
         75 |        340        3.40       92.71
         99 |        729        7.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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