Frequencies for mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1962 | 4 0.49 0.49 1969 | 5 0.61 1.10 1976 | 2 0.25 1.35 1977 | 1 0.12 1.47 1979 | 1 0.12 1.59 1980 | 2 0.25 1.84 1981 | 2 0.25 2.08 1982 | 1 0.12 2.21 1983 | 5 0.61 2.82 1984 | 2 0.25 3.06 1985 | 3 0.37 3.43 1986 | 13 1.59 5.02 1987 | 12 1.47 6.50 1988 | 17 2.08 8.58 1989 | 6 0.74 9.31 1990 | 20 2.45 11.76 1991 | 23 2.82 14.58 1992 | 12 1.47 16.05 1993 | 27 3.31 19.36 1994 | 16 1.96 21.32 1995 | 27 3.31 24.63 1996 | 23 2.82 27.45 1997 | 25 3.06 30.51 1998 | 42 5.15 35.66 1999 | 19 2.33 37.99 2000 | 23 2.82 40.81 2001 | 43 5.27 46.08 2002 | 21 2.57 48.65 2003 | 31 3.80 52.45 2004 | 37 4.53 56.99 2005 | 56 6.86 63.85 2006 | 50 6.13 69.98 2007 | 30 3.68 73.65 2008 | 14 1.72 75.37 2009 | 22 2.70 78.06 2010 | 2 0.25 78.31 9999 | 37 4.53 82.84 . | 140 17.16 100.00 ------------+----------------------------------- Total | 816 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016