Unit Roots in Macroeconomic Time Series: Some Critical Issues
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This paper suggests that the relevant question concerning unit root' in the U.S. real GNP time series pertains to the relative importance of difference-stationary and trend-stationary components. Various analytical approaches indicate than an accurate answer is not obtainable with existing data. The
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美国国家经济研究局创建时间：
1993-05-01
