On correcting the concentration index for binary variables
回应了Erreygers和Wagstaff关于健康条件患病率社会经济不平等测量中集中指数修正的争论，调和了双方观点，明确了Wagstaff修正中的价值判断，并通过欧洲健康、老龄化和退休调查数据实证展示了不同指数选择的影响。
This article discusses measurement of socioeconomic inequalities in the prevalence of a health condition, in response to the recent exchange between Guido Erreygers and Adam Wagstaff, in which they discuss the merits of their own corrections to the frequently used concentration index. We first reconcile their debate and discuss the value judgments implicit in their indices. Next, we provide a formal definition of the previously undefined value judgment in Wagstaff's correction. Finally, we show empirically that the choice of index matters, as illustrated by comparisons between countries using data from the European Survey of Health, Ageing and Retirement.