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Efficient Tests for an Autoregressive Unit Root
Open accessAbstract
The asymptotic power envelope is derived for point-optimal tests of a unit root in the autoregressive representation of a Gaussian time series under various trend specifications. We propose a family of tests whose asymptotic power functions are tangent to the power envelope at one point and are never far below the envelope. When the series has no deterministic component, some previously proposed tests are shown to be asymptotically equivalent to members of this family. When the series has an unknown mean or linear trend, commonly used tests are found to be dominated by members of the family of point-optimal invariant tests. We propose a modified version of the Dickey-Fuller t test which has substantially improved power when an unknown mean or trend is present. A Monte Carlo experiment indicates that the modified test works well in small samples.
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Metadata
- Authors
- Elliott, G., Rothenberg, T., & Stock, J.
- Venue
- National Bureau of Economic Research
- Publisher
- National Bureau of Economic Research
- Published
- 1992-12
- OpenAlex
- W3123185352
- Cited by
- 4,231
- References
- 0
- Type
- report
- Language
- en
- Open access
- green
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