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

      FIRST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,515       55.15       55.15
       1995 |        752        7.52       62.67
       1996 |      1,618       16.18       78.85
       1997 |      1,151       11.51       90.36
       1998 |        521        5.21       95.57
       9999 |        381        3.81       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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