Ourti, T.G.M. van

health income inequality index effect concentration index country concentration variable distribution model equation economic result indices income inequality group table journal number value change difference cohort level household measure income growth wagstaff individual health care estimate panel growth insurance measurement doorslaer section property paper sample gini index approach policy grouping status university worden category correction hospital supplementen coefficient erreyger supplement scale ourti subject mortality analysis condition european function observation income elasticity information van doorslaer correction term health care payments increase study evidence ill-health elasticity signi question inequity error figure regression