Σύγκριση μεθόδων

	Lorenz Curve	Gini Coefficient	Palma Ratio
Πεδίο	Sociology	Sociology	Sociology
Οικογένεια	Process / pipeline	Process / pipeline	Process / pipeline
Έτος προέλευσης	1905	1912	2011 (Palma's finding); 2013–2014 (the ratio)
Δημιουργός	Max Otto Lorenz	Corrado Gini	Gabriel Palma; named by Cobham & Sumner
Τύπος	Graphical representation of distributional inequality	Scalar measure of statistical dispersion / inequality	Tail-ratio inequality measure
Θεμελιώδης πηγή	Lorenz, M. O. (1905). Methods of measuring the concentration of wealth. Publications of the American Statistical Association, 9(70), 209–219.	Ceriani, L., & Verme, P. (2012). The origins of the Gini index: extracts from Variabilità e Mutabilità (1912) by Corrado Gini. The Journal of Economic Inequality, 10(3), 421–443.	Cobham, A., & Sumner, A. (2014). Is inequality all about the tails? The Palma measure of income inequality. Significance, 11(1), 10–13.
Εναλλακτικές ονομασίες	Lorenz concentration curve, Lorenz diagram, cumulative share curve	Gini index, Gini ratio, Gini concentration ratio, G	Palma index, Palma measure, top10/bottom40 ratio
Συναφείς	5	5	5
Σύνοψη	The Lorenz curve is a graphical device that displays the full shape of inequality in a distribution by plotting the cumulative share of a quantity (such as income) held by the cumulative share of the population, ranked from poorest to richest. Introduced by Max Lorenz in 1905, it underlies the Gini coefficient and provides the basis for ranking distributions by inequality when one curve lies entirely above another.	The Gini coefficient is the most widely used single-number summary of inequality in a distribution such as income or wealth. Introduced by the Italian statistician Corrado Gini in 1912, it equals twice the area between the Lorenz curve and the line of perfect equality, ranging from 0 when everyone has the same amount to a maximum approaching 1 when one unit holds everything.	The Palma ratio measures income inequality as the ratio of the income share held by the richest 10 percent of the population to the share held by the poorest 40 percent. It rests on the empirical regularity, documented by Gabriel Palma, that the middle deciles (5 through 9) capture a remarkably stable half of national income across countries, so that inequality is essentially a contest between the top and the bottom — the 'tails' of the distribution.