Table B-4. Standard errors for table 4: Event dropout rates of 15- through 24-year-olds who dropped out of grades 10–12, by family income: October 1972 through October 2004
		Family income
Year	Total	Low income	Middle income	High income
1972	0.33	1.55	0.45	0.39
1973	0.33	1.65	0.46	0.32
1974	0.34	†	†	†
1975	0.32	1.57	0.43	0.38
1976	0.32	1.61	0.46	0.34
1977	0.34	1.57	0.48	0.35
1978	0.34	1.69	0.48	0.40
1979	0.34	1.62	0.47	0.44
1980	0.33	1.51	0.46	0.38
1981	0.33	1.50	0.45	0.41
1982	0.34	1.52	0.46	0.36
1983	0.33	1.35	0.48	0.39
1984	0.33	1.49	0.45	0.37
1985	0.34	1.53	0.47	0.39
1986	0.32	1.33	0.45	0.34
1987	0.30	1.29	0.45	0.27
1988	0.36	1.59	0.48	0.35
1989	0.36	1.43	0.50	0.33
1990	0.34	1.39	0.45	0.33
1991	0.34	1.43	0.44	0.31
1992	0.35	1.42	0.46	0.36
1993	0.36	1.57	0.46	0.35
1994	0.34	1.44	0.44	0.41
1995	0.35	1.36	0.47	0.39
1996	0.34	1.34	0.46	0.41
1997	0.32	1.36	0.41	0.37
1998	0.33	1.34	0.39	0.46
1999	0.33	1.26	0.44	0.40
2000	0.33	1.23	0.45	0.35
2001	0.33	1.36	0.45	0.37
2002	0.27	1.05	0.36	0.34
2003	0.28	1.04	0.39	0.30
2004	0.30	1.24	0.39	0.41
† Not applicable. NOTE: Some of the standard error estimates in this table may differ from those previously published due to changes in the generalized variance parameters developed by the U.S. Census Bureau. SOURCE: U.S. Department of Commerce, Census Bureau, Current Population Survey (CPS), October 1972–2004.