The paper deals with the construction of a co-movement indicator suitable for assessing the synchrony between countries. The indicator is represented as a time series and its construction is based on a reconstruction of a co-spectrum measure from the time-frequency to the time domain. We use the statistically significant part of the power wavelet co-spectrum for pairs of countries. An advantage of the newly proposed co-movement indicator is a possibility to construct sub-indicators which correspond to the predefined frequency range, e.g. business cycle frequencies. In such a way we can obtain a decomposition of the co-movement indicator (covering all frequencies) into, for example, short-run cycles, medium and long business cycles and long-run cycles. The proposed methodology is demonstrated on the US and EA monthly data of industrial production index in 1991 – 2018. A further application is performed on the EA and Visegrad Group Countries with the same data type and time range.
Brno University of Technology, Faculty of Electrical Engineering and Communication, Technická 12, 616 00 Brno, Czech Republic
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