Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1940 | 1 0.01 0.01 1951 | 3 0.03 0.04 1959 | 2 0.02 0.06 1961 | 7 0.07 0.13 1963 | 3 0.03 0.16 1964 | 3 0.03 0.19 1965 | 13 0.13 0.32 1966 | 12 0.12 0.44 1967 | 11 0.11 0.55 1968 | 12 0.12 0.67 1969 | 23 0.23 0.90 1970 | 27 0.27 1.17 1971 | 20 0.20 1.37 1972 | 27 0.27 1.64 1973 | 51 0.51 2.15 1974 | 48 0.48 2.63 1975 | 28 0.28 2.91 1976 | 51 0.51 3.42 1977 | 63 0.63 4.05 1978 | 78 0.78 4.83 1979 | 160 1.60 6.43 1980 | 113 1.13 7.56 1981 | 107 1.07 8.63 1982 | 136 1.36 9.99 1983 | 163 1.63 11.62 1984 | 325 3.25 14.87 1985 | 385 3.85 18.72 1986 | 441 4.41 23.13 1987 | 477 4.77 27.90 1988 | 531 5.31 33.21 1989 | 521 5.21 38.42 1990 | 501 5.01 43.43 1991 | 533 5.33 48.76 1992 | 486 4.86 53.62 1993 | 557 5.57 59.19 1994 | 647 6.47 65.66 1995 | 698 6.98 72.64 1996 | 569 5.69 78.33 1997 | 697 6.97 85.30 1998 | 542 5.42 90.72 1999 | 51 0.51 91.23 9999 | 152 1.52 92.75 . | 725 7.25 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016