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A Nonparametric Copula Based Test for Conditional Independence with Applications to Granger Causality

  • Taoufik Bouezmarni
  • Jeroen Rombouts
  • Abderrahim Taamouti

This paper proposes a new nonparametric test for conditional independence, which is based on the comparison of Bernstein copula densities using the Hellinger distance. The test is easy to implement because it does not involve a weighting function in the test statistic, and it can be applied in general settings since there is no restriction on the dimension of the data. In fact, to apply the test, only a bandwidth is needed for the nonparametric copula. We prove that the test statistic is asymptotically pivotal under the null hypothesis, establish local power properties, and motivate the validity of the bootstrap technique that we use in finite sample settings. A simulation study illustrates the good size and power properties of the test. We illustrate the empirical relevance of our test by focusing on Granger causality using financial time series data to test for nonlinear leverage versus volatility feedback effects and to test for causality between stock returns and trading volume. In a third application, we investigate Granger causality between macroeconomic variables. Le présent document propose un nouveau test non paramétrique d'indépendance conditionnelle, lequel est fondé sur la comparaison des densités de la copule de Bernstein suivant la distance de Hellinger. Le test est facile à réaliser, du fait qu'il n'implique pas de fonction de pondération dans les variables utilisées et peut être appliqué dans des conditions générales puisqu'il n'y a pas de restriction sur l'étendue des données. En fait, dans le cas de la copule non paramétrique, l'application du test ne requiert qu'une largeur de bande. Nous démontrons que les variables utilisées pour le test jouent asymptotiquement un rôle crucial sous l'hypothèse nulle. Nous établissons aussi les propriétés des pouvoirs locaux et justifions la validité de la technique bootstrap (technique d'auto-amorçage) que nous utilisons dans les contextes où les échantillons sont de taille finie. Une étude par simulation illustre l'ampleur adéquate et la puissance du test. Nous démontrons la pertinence empirique de notre démarche en mettant l'accent sur les liens de causalité de Granger et en recourant à des séries temporelles de données financières pour vérifier l'effet de levier non linéaire, par opposition à l'effet de rétroaction de la volatilité, et la causalité entre le rendement des actions et le volume des transactions. Dans une troisième application, nous examinons les liens de causalité de Granger entre certaines variables macroéconomiques.

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Paper provided by CIRANO in its series CIRANO Working Papers with number 2009s-28.

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Length: 45 pages
Date of creation: 01 Jun 2009
Date of revision:
Handle: RePEc:cir:cirwor:2009s-28
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