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Maximum likelihood inference on cointegration and seasonal cointegration. (English) Zbl 0757.62058
Summary: Testing procedures for cointegration and seasonal cointegration are developed for nonstationary time series which have unit roots at seasonal frequencies as well as at the zero frequency. Using maximum likelihood inference, we estimate and test the hypothesis for the existence of cointegrating vectors at each frequency in the presence of unit roots at other seasonal frequencies. The basic finding is that several null hypotheses can be tested separately for each case of interest without any prior knowledge about the existence of cointegration relations at other frequencies.
The asymptotic distribution theory is derived, and the critical values are generated by Monte Carlo simulations. The problems on the use of seasonally adjusted data are discussed, and an empirical example is illustrated by using Canadian data on unemployment and immigration rates.

MSC:
62P20 Applications of statistics to economics
62M10 Time series, auto-correlation, regression, etc. in statistics (GARCH)
91B84 Economic time series analysis
62E20 Asymptotic distribution theory in statistics
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