手法を比較

	Arriaga Decomposition	Kitagawa Decomposition
分野	人口学	人口学
系統	Process / pipeline	Process / pipeline
提唱年	1984	1955
提唱者	Eduardo E. Arriaga	Evelyn M. Kitagawa
種類	Age-specific decomposition of a difference in life expectancy	Arithmetic decomposition of a difference between two summary rates
原典	Arriaga, E. E. (1984). Measuring and explaining the change in life expectancies. Demography, 21(1), 83–96.	Kitagawa, E. M. (1955). Components of a difference between two rates. Journal of the American Statistical Association, 50(272), 1168–1194.
別名	Arriaga's method, Life-expectancy decomposition, Age decomposition of life expectancy, Arriaga Ayrıştırması	Components-of-difference method, Rate decomposition, Standardization decomposition, Kitagawa Ayrıştırması
関連	4	4
概要	Arriaga decomposition is a demographic technique that breaks down the difference in life expectancy between two life tables — two countries, two time points, or two groups — into the contributions of mortality change at each age. Introduced by Eduardo Arriaga in 1984, it tells the analyst not just that life expectancy rose or fell, but exactly which ages drove the change, separating the direct effect of mortality change within an age interval from the indirect effect of the extra survivors that change passes on to older ages.	Kitagawa decomposition is a demographic technique that splits the difference between two summary rates — such as two crude death rates, birth rates, or prevalence figures — into the part attributable to differences in the underlying group-specific rates and the part attributable to differences in population composition. Introduced by Evelyn Kitagawa in 1955, it answers whether a gap between two populations reflects genuinely different risks or merely a different age (or other) structure.