▁is ▁greatest . ▁ ▁The ▁size ▁of ▁the ▁gap ▁is ▁equal ▁to ▁half ▁of ▁the ▁relative ▁mean ▁absolute ▁deviation : ▁ ▁See ▁also ▁▁ ▁Distribution ▁( e conom ics ) ▁ ▁Distribution ▁of ▁wealth ▁ ▁W elf are ▁econom ics ▁ ▁In come ▁inequality ▁metrics ▁ ▁G ini ▁coefficient ▁ ▁Ho over ▁index ▁( a . k . a . ▁Robin ▁H ood ▁index ) ▁ ▁RO C ▁analysis ▁ ▁Social ▁w elf are ▁( polit ical ▁science ) ▁ ▁Econom ic ▁inequality ▁ ▁Z ip f ' s ▁law ▁ ▁P are to ▁distribution ▁ ▁Mean ▁deviation ▁ ▁References ▁ ▁Further ▁reading ▁ ▁External ▁links ▁ ▁W I ID : ▁World ▁In come ▁I ne quality ▁Database , ▁a ▁source ▁of ▁information ▁on ▁inequality , ▁collected ▁by ▁W ID ER ▁( World ▁Institute ▁for ▁Development ▁Econom ics ▁Research , ▁part ▁of ▁United ▁Nations ▁University ) ▁ ▁gl cur ve : ▁St ata ▁module ▁to ▁plot ▁Lor enz ▁curve ▁( type ▁" find it ▁gl cur ve " ▁or ▁" ss c ▁install ▁gl cur ve " ▁in ▁St ata ▁prompt ▁to ▁install ) ▁ ▁Free ▁add - on ▁to ▁ST ATA ▁to ▁compute ▁inequality ▁and ▁pover ty ▁measures ▁ ▁Free ▁Online ▁Software ▁( Calcul ator ) ▁comput es ▁the ▁G ini ▁Co efficient , ▁plots ▁the ▁Lor enz ▁curve , ▁and ▁comput es ▁many ▁other ▁measures ▁of ▁concentration ▁for ▁any ▁dataset ▁ ▁Free ▁Calcul ator : ▁Online ▁and ▁download able ▁scripts ▁( Python ▁and ▁Lu a ) ▁for ▁At kin son ,