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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,105       41.05       41.05
         24 |          1        0.01       41.06
         47 |          1        0.01       41.07
         66 |          1        0.01       41.08
         71 |          1        0.01       41.09
         73 |          2        0.02       41.11
         74 |      1,471       14.71       55.82
         75 |      1,762       17.62       73.44
         76 |      1,398       13.98       87.42
         77 |        517        5.17       92.59
         99 |        741        7.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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