Kakwani, N.

health inequality error illness journal group sample / journal i n e method econometrics value distribution table ill-health kakwani sample estimate individual-level data person paper regression health care health inequality morbidity 87-103 estimate standardization concentration population variance tth seg indices wagstaff self-assessed health income index morbidity rate statistic equity individual-level society degree score doorslaer result level difference curve observation crude morbidity rates oxford university press person i appendix b account appendix delivery illness rates concentration curve t-test derivation self-assessed c h r economic income groups van doorslaer university table 2 t segs formulae effect application member number illustration measure decile alternative order sample estimates structure