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Amplitude and phase synchronization of European business cycles: a wavelet approach

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Published/Copyright: May 21, 2015

Abstract

In the paper we suggest the use of amplitude correlation coefficients (ACCs) and phase-locking values (PLVs) in examining business cycle synchronization. The quantities are calculated on the basis of instantaneous amplitudes and phase differences, which are computed here with the help of the non-decimated discrete analytic wavelet transform. We show that the coefficients constitute an interesting add-in to the statistical apparatus of examining business cycle synchronization. The PLVs correct the information provided by the coherency and correlation coefficients for the influence of amplitude changes and are of use in examining phase synchronization of business cycles, which is important in forecasting the effectiveness of a common monetary policy. By contrast, the ACCs are based solely on amplitude information and have the interpretation of phase-adjusted correlation coefficients, which can be used to evaluate stabilization policies or to forecast these policies’ effectiveness. The methodology is applied to examine cyclical synchronization of 20 European Union (EU) countries. We show, among other things, that during the run-up to the euro both amplitude and phase synchronization increased, with the former tending to change more rapidly. Furthermore, for the new EU members an EU effect is identified in both types of cyclical synchronization with the euro area.

JEL codes: C14; C38; E32; O52

Corresponding author: Joanna Bruzda, Nicolaus Copernicus University, Gagarina 11, 87-100 Torun, Poland, e-mail:

Acknowledgments

The author acknowledges the financial support from the Polish National Science Center obtained under decision no. DEC-2013/09/B/HS4/02716. The paper has benefited from discussions with Maciej Ryczkowski from the Nicolaus Copernicus University in Toruń as well as helpful, encouraging, and constructive suggestions of the Referees.

Funding: Polish National Science Center, (Grant/Award Number: DEC-2013/09/B/HS4/02716).

Annex

This annex provides a detailed description of the three datasets used in the study.

The first set comprises the GDP estimates from the Quarterly National Accounts database available at the OECD statistical portal. The series used are “Historical GDP – expenditure approach” (B1_GE) in millions of national currency, volume estimates, seasonally adjusted (denoted in the database as VOBARSA). This set of quarterly data covers time series for the 15 old member states of the EU (Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Portugal, Spain, Sweden, and the UK), for which the data span the period 1960.I–2014.III (219 observations), except for Luxembourg, where the data end in 2014.II, as well as five new UE member states: the Czech Republic (1994.I–2014.III; 83 observations), Hungary (1995.I–2014.III; 79 observations), Poland (1995.I–2014.III; 79 observations), Slovakia (1993.I–2014.III; 87 observations), Slovenia (1995.I–2014.III; 79 observations), and the euro area (18 countries; 1995.I–2014.III; 79 observations).

The second dataset covers IP indexes for the 20 countries under study and the euro area (18 countries) from the Main Economic Indicators database of the OECD. The variable used is the seasonally adjusted “Production of Total Industry.” Taking into consideration the availability of the data, the maximum possible time period of analysis for all the 15 old EU member states is July 1975 through September 2014, and this is the data span used here (471 monthly observations). The euro area aggregate is also available in this time period. The time series for the remaining five countries are much shorter and cover the following periods: the Czech Republic – 1990.01–2014.09 (297 observations), Hungary – 1985.01–2014.09 (357 observations), Poland – 1985.01–2014.09 (357 observations), Slovakia – 1989.01–2014.09 (309 observations), and Slovenia – 1992.01–2014.09 (273 observations).

The last set of data comprises the monthly ESI series available at the European Commission portal. The ESI is a composite indicator computed as a weighted average of five seasonally adjusted survey-based confidence indicators: Industrial Confidence Indicator (40%), Services Confidence Indicator (30%), Consumer Confidence Indicator (20%), Construction Confidence Indicator (5%), and Retail Trade Confidence Indicator (5%). The time period covered by this dataset changes from country to country and also extends slightly further in time as compared to the previous sets. The longest time series, available for Austria, Belgium, Denmark, Finland, Germany, Greece, Italy, Luxembourg, the Netherlands, the UK, and the euro area, contain data from the period 1985.01 to 2014.11 (359 observations), whereas, for the other countries under study, the time periods covered are the following: France – 1985.02–2014.11 (358 observations), Portugal – 1987.01–2014.11 (335 observations), Spain – 1987.04–2014.11 (332 observations), Sweden – 1990.01–2014.11 (299 observations), the Czech Republic – 1995.01–2014.11 (239 observations), Hungary – 1996.01–2014.11 (227 observations), Poland – 1993.10–2014.11 (254 observations), Slovakia – 1993.08–2014.11 (256 observations), and Slovenia – 1995.04–2014.11 (236 observations). This set does not contain data for Ireland.

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Supplemental Material

The online version of this article (DOI: 10.1515/snde-2014-0081) offers supplementary material, available to authorized users.


Published Online: 2015-5-21
Published in Print: 2015-12-1

©2015 by De Gruyter

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