Lindeboom, M.

health vignette education model effect heterogeneity response mobility domain indicator difference table problem measure cognition level individual country objective cut-point income response consistency assumption visit 0.000 respondent vignette equivalence journal result doorslaer evidence health domains group index proxy approach function disability condition inequality sample consistency van doorslaer shift study survey measurement covariate self-rated health category china indonesia number dif ficulty signi india probability behaviour vignettes approach rating doctor threshold objective health indicators variation equivalence probit employment estimate specialist 2007 john wiley self-reported wealth hopit objective indicators ficient lindeboom identi netherland signi ficance self-rated