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Using different null hypotheses to test for seasonal unit roots in economic time series

  • Antônio Aguirre

    ()

  • Andreu Sansó

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.

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Paper provided by Cedeplar, Universidade Federal de Minas Gerais in its series Textos para Discussão Cedeplar-UFMG with number td124.

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Length: 20 pages
Date of creation: 1999
Date of revision:
Handle: RePEc:cdp:texdis:td124
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References listed on IDEAS
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  1. Hyllerberg, S. & Engle, R.F. & Granger, C.W.J. & Yoo, B.S., 1988. "Seasonal Integration And Cointegration," Papers 0-88-2, Pennsylvania State - Department of Economics.
  2. Joseph Beaulieu, J. & Miron, Jeffrey A., 1993. "Seasonal unit roots in aggregate U.S. data," Journal of Econometrics, Elsevier, vol. 55(1-2), pages 305-328.
  3. Canova, Fabio & Hansen, Bruce E, 1995. "Are Seasonal Patterns Constant over Time? A Test for Seasonal Stability," Journal of Business & Economic Statistics, American Statistical Association, vol. 13(3), pages 237-52, July.
  4. Antonio Aguirre, 1995. "Uma introdução à análise espectral de séries temporais econômicas," Textos para Discussão Cedeplar-UFMG td081, Cedeplar, Universidade Federal de Minas Gerais.
  5. Andreu Sanso & Manuel Artis Ortuno & Jordi Surinach Caralt, 1998. "Comportamiento en muestra finita de los contrastes de integracion estacional para datos mensuales," Working Papers in Economics 43, Universitat de Barcelona. Espai de Recerca en Economia.
  6. Andrew C Harvey & Andrew Scott, 1994. "Seasonality in Dynamic Regression Models," CEP Discussion Papers dp0184, Centre for Economic Performance, LSE.
  7. Antonio Aguirre, 1995. "Uma introdução à análise espectral de séries temporais econômicas," Nova Economia, Economics Department, Universidade Federal de Minas Gerais (Brazil), vol. 5(1), pages 41-60, August.
  8. Dickey, David A & Pantula, Sastry G, 2002. "Determining the Order of Differencing in Autoregressive Processes," Journal of Business & Economic Statistics, American Statistical Association, vol. 20(1), pages 18-24, January.
  9. Ilmakunnas, Pekka, 1990. "Testing the Order of Differencing in Quarterly Data: An Illustration of the Testing Sequence," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 52(1), pages 79-88, February.
  10. Antonio Aguirre, 1997. "Testing for seasonal unit roots in a quarterly series of beef cattle prices in the state of São Paulo (Brazil)," Textos para Discussão Cedeplar-UFMG td115, Cedeplar, Universidade Federal de Minas Gerais.
  11. Osborn, Denise R, et al, 1988. "Seasonality and the Order of Integration for Consumption," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 50(4), pages 361-77, November.
  12. Ghysels, E., 1990. "On the Economic and Econometrics of Seasonality," Cahiers de recherche 9028, Universite de Montreal, Departement de sciences economiques.
  13. Dickey, David A & Fuller, Wayne A, 1981. "Likelihood Ratio Statistics for Autoregressive Time Series with a Unit Root," Econometrica, Econometric Society, vol. 49(4), pages 1057-72, June.
  14. Philip Hans Franses And A. M. Robert Taylor, 2000. "Determining the order of differencing in seasonal time series processes," Econometrics Journal, Royal Economic Society, vol. 3(2), pages 250-264.
  15. J. Joseph Beaulieu & Jeffrey A. Miron, 1991. "A Cross Country Comparison of Seasonal Cycles and Business Cycles," Papers 0011, Boston University - Industry Studies Programme.
  16. Antonio Aguirre & Luis Antonio Aguirre, 2000. "Time series analysis of monthly beef cattle prices with nonlinear autoregressive models," Applied Economics, Taylor & Francis Journals, vol. 32(3), pages 265-275.
  17. Hylleberg, Svend, 1995. "Tests for seasonal unit roots general to specific or specific to general?," Journal of Econometrics, Elsevier, vol. 69(1), pages 5-25, September.
  18. Osborn, Denise R., 1990. "A survey of seasonality in UK macroeconomic variables," International Journal of Forecasting, Elsevier, vol. 6(3), pages 327-336, October.
  19. Margarido, Mario Antonio & Kato, Heitor T. & Bueno, Carlos Roberto Ferreira & Junior, Edison Cambon, 1996. "Análise dos impactos das cotações do dólar paralelo e do índice pluviométrico sobre os preços do boi gordo no estado de S. Paulo," Revista Brasileira de Economia, FGV/EPGE Escola Brasileira de Economia e Finanças, Getulio Vargas Foundation (Brazil), vol. 50(2), April.
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