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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,072       30.72       30.72
         25 |          1        0.01       30.73
         40 |          1        0.01       30.74
         41 |          2        0.02       30.76
         42 |          1        0.01       30.77
         43 |          3        0.03       30.80
         45 |          1        0.01       30.81
         46 |          1        0.01       30.82
         47 |          5        0.05       30.87
         48 |          3        0.03       30.90
         49 |          3        0.03       30.93
         50 |          2        0.02       30.95
         51 |          5        0.05       31.00
         52 |          7        0.07       31.07
         53 |         10        0.10       31.17
         54 |         10        0.10       31.27
         55 |         17        0.17       31.44
         56 |         10        0.10       31.54
         57 |          7        0.07       31.61
         58 |         11        0.11       31.72
         59 |         30        0.30       32.02
         60 |         22        0.22       32.24
         61 |         27        0.27       32.51
         62 |         26        0.26       32.77
         63 |         13        0.13       32.90
         64 |         31        0.31       33.21
         65 |         40        0.40       33.61
         66 |         90        0.90       34.51
         67 |         96        0.96       35.47
         68 |        122        1.22       36.69
         69 |        258        2.58       39.27
         70 |        422        4.22       43.49
         71 |      1,095       10.95       54.44
         72 |        868        8.68       63.12
         73 |        838        8.38       71.50
         74 |        889        8.89       80.39
         75 |        850        8.50       88.89
         76 |        369        3.69       92.58
         99 |        742        7.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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