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Stationarity Tests for Irregularly Spaced Observations and the Effects of Sampling Frequency on Power, 2005, Econometric Theory 21, 757-794 (with F. Busetti).
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Variance Ratio Tests of the Seasonal Unit Root Hypothesis, 2005, Journal of Econometrics 124, 33-54.
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Tests of Stationarity against a Change in Persistence, 2004, Journal of Econometrics 123, 33-66 (with F. Busetti).
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Bootstrapping the HEGY Seasonal Unit Roots Tests, 2004, Journal of Econometrics 123, 67-87 (with P Burridge).
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Asymptotic Distributions for Regression-Based Seasonal Unit Root Test Statistics in a Near-Integrated Model, 2004, Econometric Theory 20, 645-670 (with P.M. Rodrigues).
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Regression-based unit root tests with recursive mean adjustment for seasonal and nonseasonal time series, 2002, Journal of Business and Economic Statistics 20, 269-281.
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