Erreygers, G.

health index inequality indices variable concentration index property value wagstaff erreyger concentration measurement mirror scale mirror property rank-dependent economic distribution rank-dependent inequality indices health variables function scale invariance condition paper difference level change proposition weight normalization journal wagstaff index indicator individual ordinal ratio-scale measurement scale ourti class section income measure invariance erreygers index health economics health inequality rank-dependent indices quasi-relativity example mirror condition scale-invariant weighting function doorslaer person value judgments health inequalities sign condition number inequality measurement table distributional university bound ordinal health indicators sensitivity weighting country inverse-relative inequality index modi fied ci judgment figure measurement scales inequality indices quasi-relative rank-dependent inequality index point antenatal visits quasi-absolute van doorslaer