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我们在基尼系数研究文献中所看到的任何一个基尼系数值,都是以基尼系数值的计算者所使用的特定“收入”定义、特定的数据采集和估算方法、特定的价格指标、特定的收入分布拟合函数或基尼系数计算方法以及特定的样本集合为前提的。由于不同的基尼系数计算者在进行基尼系数的计算时所使用的收入定义、数据估算方法、价格指数、计算方式和抽样范围等都可能存在差别,不同研究文献所提供的基尼系数数据相互之间不一定具有同质性或可比性。因此,将不同文献分别提供的某一国家或地区不同年份的基尼系数值简单地连贯起来,用以考察该国或该地区收入差距的历史趋势,或者将不同文献分别提供的不同国家或地区的基尼系数值简单地归置一处,用以比较不同国家或地区居民的收入差距,应该说在逻辑上都是可以质疑的。
Any of the Gini coefficient values we see in the Gini coefficient research literature are based on specific “income” definitions used by calculators of Gini coefficient values, specific data collection and estimation methods, specific price indicators, Specific income distribution fitting function or Gini coefficient calculation method and the specific sample set as a precondition. Because different Gini coefficient calculators use Gini coefficient in the calculation of income definitions, data estimation methods, price indices, calculation methods and sampling range may be different, the Gini coefficient data provided by different research literature among each other Not necessarily homogenous or comparable. Therefore, the Gini coefficient values in different years of a country or region respectively provided by different literatures are simply coherently used to examine the historical trend of the income gap in the country or region, or to compare the Gini coefficient values of different countries or regions It is logically possible to say that the Gini coefficient is simply resettled to compare the income gap among residents of different countries or regions.