Using different null hypotheses to test for seasonal unit roots in economic time series
This paper tries to make a contribution by discussing the application of different testing procedures to determine the seasonal properties of quarterly data. We focus on the Hylleberg et al. and on the Canova-Hansen tests. The former detect a unit root at the zero frequency but no seasonal unit roots. The latter reveal that the series displays a statistically significant seasonal pattern with changing coefficients of some seasonal dummy variables. The CH tests finding of a seasonal unit root at frequency ? does not agree with the HEGY-type test results. An explanation is given to try to interpret these two contradictory outcomes.
(This abstract was borrowed from another version of this item.)
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