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

      FIRST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,358       53.58       53.58
       1997 |        788        7.88       61.46
       1998 |      1,629       16.29       77.75
       1999 |      1,235       12.35       90.10
       2000 |        514        5.14       95.24
       9999 |        415        4.15       99.39
          . |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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