Cut-point shift and index shift in self-reported health
Journal of Health Economics , Volume 23 - Issue 6 p. 1083- 1099
There is some concern that ordered responses on health questions may differ across populations or even across subgroups of a population. This reporting heterogeneity may invalidate group comparisons and measures of health inequality. This paper proposes a test for differential reporting in ordered response models which enables to distinguish between cut-point shift and index shift. The method is illustrated using Canadian National Population Health Survey data. The McMaster Health Utility Index Mark 3 (HUI3) is used as a more objective health measure than the simple five-point scale of self-assessed health. We find clear evidence of index shifting and cut-point shifting for age and gender, but not for income, education or language.
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Lindeboom, M, & van Doorslaer, E.K.A. (2004). Cut-point shift and index shift in self-reported health. Journal of Health Economics (Vol. 23, pp. 1083–1099). doi:10.1016/j.jhealeco.2004.01.002