השוואת שיטות

	Kitagawa Decomposition	Arriaga Decomposition
תחום	דמוגרפיה	דמוגרפיה
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1955	1984
הוגה השיטה	Evelyn M. Kitagawa	Eduardo E. Arriaga
סוג	Arithmetic decomposition of a difference between two summary rates	Age-specific decomposition of a difference in life expectancy
מקור מכונן	Kitagawa, E. M. (1955). Components of a difference between two rates. Journal of the American Statistical Association, 50(272), 1168–1194.	Arriaga, E. E. (1984). Measuring and explaining the change in life expectancies. Demography, 21(1), 83–96.
כינויים	Components-of-difference method, Rate decomposition, Standardization decomposition, Kitagawa Ayrıştırması	Arriaga's method, Life-expectancy decomposition, Age decomposition of life expectancy, Arriaga Ayrıştırması
קשורות	4	4
תקציר	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.	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.