Tests of the Seasonal Unit-Root Hypothesis Against Heteroscedastic Seasonal Integration
以异方差季节单整为备择的季节单位根检验AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接讨论季节单位根、随机季节根及季节非平稳性,并分析季度支出序列,研究重心属于时间序列检验。
以异方差季节单整为备择的季节单位根检验AI 解读 ↓
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This article considers the problem of testing for a nonstochastic seasonal unit root in a seasonally observed time series process against the alternative of a randomized seasonal root with mean unity; that is, the process displays heteroscedastic seasonal integration. The alternative hypothesis allows for potentially frequently occurring changes of regime in the process under investigation, allowing for more volatile forms of seasonal nonstationarity. We discuss a family of models that allow for a potentially smooth transition between the explosive and stationary phases of the seasonal model. To test this hypothesis we consider extensions to existing approaches developed to test against nonseasonal stochastic unit roots. Asymptotic representations of the test statistics are derived. An empirical application to a variety of quarterly measures of U.K. consumer's expenditure is also considered.