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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,076       40.76       40.76
         77 |          3        0.03       40.79
         78 |      1,486       14.86       55.65
         79 |      1,944       19.44       75.09
         80 |      1,321       13.21       88.30
         81 |        486        4.86       93.16
         99 |        684        6.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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