One Measure of Segregation*
提出一个数值隔离度量应满足的八条理想性质，由此导出一类与广义熵收入不平等指数相关的隔离指数，其中平方根指数满足其中七条性质。
This article considers the problem of deriving a numerical measure of segregation, i.e., a measure of inequality in the distribution of people across groups. It proposes a list of eight desirable properties for a good numerical measure of segregation. These properties yield a class of segregation indexes that are related to generalized entropy indexes of income inequality. Moreover, one and only one index—termed the square root index—satisfies seven of the properties.