This paper examines regression tests of whether x forecasts y when the largest autoregressive root of the regressor is unknown. It is shown that previously proposed two-step procedures, with first stages that consistently classify x as I(1) or I(0), exhibit large size distortions when regressors have local-to-unit roots, because of asymptotic dependence on a nuisance parameter that cannot be estimated consistently. Several alternative procedures, based on Bonferroni and Scheffe methods, are therefore proposed and investigated. For many parameter values, the power loss from using these conservative tests is small.
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Article provided by Cambridge University Press in its journal Econometric Theory.
Volume (Year): 11 (1995) Issue (Month): 05 (October) Pages: 1131-1147 Download reference. The following formats are available: HTML
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