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

      FIRST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,343       53.43       53.43
       2005 |        736        7.36       60.79
       2006 |      1,610       16.10       76.89
       2007 |      1,287       12.87       89.76
       2008 |        521        5.21       94.97
       9999 |        441        4.41       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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