Σύγκριση μεθόδων

	Atkinson Index	Foster-Greer-Thorbecke Index
Πεδίο	Sociology	Οικονομικά
Οικογένεια	Process / pipeline	Process / pipeline
Έτος προέλευσης	1970	1984
Δημιουργός	Anthony Barnes Atkinson	James Foster, Joel Greer & Erik Thorbecke
Τύπος	Welfare-based, parameterized inequality index	Parametric class of poverty measures
Θεμελιώδης πηγή	Atkinson, A. B. (1970). On the measurement of inequality. Journal of Economic Theory, 2(3), 244–263.	Foster, J., Greer, J., & Thorbecke, E. (1984). A class of decomposable poverty measures. Econometrica, 52(3), 761–766.
Εναλλακτικές ονομασίες	Atkinson inequality measure, Atkinson's A, welfare-based inequality index	FGT Index, FGT Poverty Measures, P-alpha Poverty Index, Foster-Greer-Thorbecke Poverty Measure
Συναφείς	5	4
Σύνοψη	The Atkinson index is a welfare-based measure of inequality that incorporates an explicit, analyst-chosen parameter for how much society dislikes inequality. Introduced by Anthony Atkinson in 1970, it asks what fraction of total income could be discarded, under an equal distribution, while leaving social welfare unchanged — making the ethical judgement behind any inequality comparison transparent rather than hidden.	The Foster-Greer-Thorbecke (FGT) index is a parametric class of poverty measures introduced by James Foster, Joel Greer, and Erik Thorbecke in 1984 that became the workhorse of applied poverty analysis. A single parameter alpha tunes how much weight the measure places on the depth and distribution of poverty: alpha = 0 gives the headcount ratio (the share of people below the poverty line), alpha = 1 gives the poverty gap (the average normalized shortfall), and alpha = 2 gives poverty severity (which weights larger shortfalls more heavily). Its defining virtue is additive decomposability — total poverty is the population-weighted sum of subgroup poverty — which makes it ideal for profiling poverty across regions, sectors, and demographic groups.