Robust Inference for Near-Unit Root Processes with Time-Varying Error Variances
Robust Inference for Near-Unit Root Processes with Time-Varying Error Variances
复制标题
具有时变误差方差的近单位根过程的鲁棒推理
DOI:
10.1080/07474938.2014.976525
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发表时间:
2016
影响因子:
1.2
通讯作者:
C. Hanck
中科院分区:
文献类型:
--
作者:
Demetrescu;C. Hanck
The autoregressive Cauchy estimator uses the sign of the first lag as instrumental variable (IV); under independent and identically distributed (i.i.d.) errors, the resulting IVt-type statistic is known to have a standard normal limiting distribution in the unit root case. With unconditional heteroskedasticity, the ordinary least squares (OLS)tstatistic is affected in the unit root case; but the paper shows that, by using some nonlinear transformation behaving asymptotically like the sign as instrument, limiting normality of the IVt-type statistic is maintained when the series to be tested has no deterministic trends. Neither estimation of the so-called variance profile nor bootstrap procedures are required to this end. The Cauchy unit root test has power in the same 1/Tneighborhoods as the usual unit root tests, also for a wide range of magnitudes for the initial value. It is furthermore shown to be competitive with other, bootstrap-based, robust tests. When the series exhibit a linear trend, however, the null distribution of the Cauchy test for a unit root becomes nonstandard, reminiscent of the Dickey-Fuller distribution. In this case, inference robust to nonstationary volatility is obtained via the wild bootstrap.
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影响因子:
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作者:
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通讯作者:
N. Christopeit
DOI:
--
发表时间:
2015
期刊:
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DOI:
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DOI:
--
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2000
期刊:
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