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This paper investigates the small sample properties of a unit root test under the framework of multiple level shifts when time series variables are I(1) or I(0) processes with Markov level shifts. In order to investigate these properties, we introduce a unit root test with multiple level shifts. The introduced test assumes that the unspecified number of level shifts may be larger than two but smaller...
This paper simulates power of unit root tests based on alternative procedures for undertaking GLS detrending in a linear trend model. Many of the proposed methods produce improvements (over the original approach) for small samples and autoregressive parameter near unity.
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