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本文旨在验证到底我国带有垄断性质的行业收入十分偏高,与常见的实证分析采用的t检验不同,本文采用的是非参数统计的Mann-Whitney检验,克服了t检验的主要缺陷。
The purpose of this paper is to verify whether industries with monopoly in China have very high incomes. In contrast to the usual t-test used in empirical analysis, this paper uses the Mann-Whitney test of nonparametric statistics to overcome the main shortcomings of the t-test.