A Convenient Descriptive Model of Income Distribution: The Gamma Density
收入分布的便捷描述模型:伽马密度AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确以个人收入分布和不平等参数为研究对象,并比较分布拟合及不平等差异,直接对应收入分布分析方向。
收入分布的便捷描述模型:伽马密度AI 解读 ↓
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The distribution of personal income is approximated by a two-parameter gamma density function (Pearson Type III). The two parameters may be considered as indicators of scale and of inequality, respectively. Maximum likelihood estimates of the parameters are derived from a random sample using graphical techniques, and a likelihood ratio test for the hypothesis that the inequality parameter is the same for different distributions is presented. The derivation of both the estimates and the test statistic requires computing the arithmetic and geometric means from the sample. An empirical application, including a comparison of the gamma and lognormal distributions to demonstrate the better fit of the gamma, is made to personal income data in the United States for the years 1960 to 1969. Using the gamma density, inequality is shown to decrease when unemployment or inflation decreases, or when the real national product increases.