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Covariances for estimated totals when comparing between years

Bean, Judy A.
Hyattsville, Md. (6525 Belcrest Rd., Hyattsville 20782) : U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Center for Health Statistics, [1992] 1992

International comparisons of medical care utilization a feasibility study.

White, Kerr L.
Washington, D.C. : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Services and Mental Health Administration, [1969] 1969