The Trend Behavior of Alternative Income Inequality Measures in the United States From 1947–1990 and the Structural Break
检验美国收入不平等时间序列是否存在结构断点，发现分段趋势模型比随机趋势模型更适合描述其变化。
This article tests the hypothesis that the time series process of income inequality has experienced a structural break. The timing of the structural break is treated as an unknown parameter to be estimated from the data because it is not possible to associate a single episodic policy event with the break year and to avoid bias in favor of a unit-root hypothesis if the break was near the selected year. For several measures of income inequality a segmented trend model is more appropriate to account for the fundamentals affecting the behavior of income inequality as opposed to a stochastic trend model.