Multiple Testing for No Cointegration Under Nonstationary Volatility
Multiple Testing for No Cointegration Under Nonstationary Volatility
复制标题
非平稳波动下无协整的多重检验
DOI:
10.1111/obes.12214
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
C. Hanck
中科院分区:
文献类型:
--
作者:
Demetrescu;C. Hanck
With cointegration tests often being oversized under time‐varying error variance, it is possible, if not likely, to confuse error variance non‐stationarity with cointegration. This paper takes an instrumental variable (IV) approach to establish individual‐unit test statistics for no cointegration that are robust to variance non‐stationarity. The sign of a fitted departure from long‐run equilibrium is used as an instrument when estimating an error‐correction model. The resulting IV‐based test is shown to follow a chi‐square limiting null distribution irrespective of the variance pattern of the data‐generating process. In spite of this, the test proposed here has, unlike previous work relying on instrumental variables, competitive local power against sequences of local alternatives in 1/T‐neighbourhoods of the null. The standard limiting null distribution motivates, using the single‐unit tests in a multiple testing approach for cointegration in multi‐country data sets by combiningP‐values from individual units. Simulations suggest good performance of the single‐unit and multiple testing procedures under various plausible designs of cross‐sectional correlation and cross‐unit cointegration in the data. An application to the equilibrium relationship between short‐ and long‐term interest rates illustrates the dramatic differences between results of robust and non‐robust tests.
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DOI:
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发表时间:
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期刊:
影响因子:
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DOI:
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发表时间:
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期刊:
影响因子:
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