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

      FIRST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,297       52.97       52.97
         91 |        797        7.97       60.94
         92 |      1,629       16.29       77.23
         93 |      1,188       11.88       89.11
         94 |        541        5.41       94.52
         99 |        486        4.86       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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