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Some Pretesting Issues on Testing for Granger Noncausality

  • Judith A. Giles

    ()

  • Sadaf Mirza

We compare testing strategies for Granger noncausality in vector autoregressions (VARs) that may or may not have unit roots and cointegration. Sequential testing methods are examined; these test for cointegration and use either a differenced VAR or a vector error correction model (VECM), in which to undertake the main noncausality test. Basically, the pretesting strategies attempt to verify the validity of appropriate standard limit theory. These methods are contrasted with an augmented lag approach that ensures the limiting Chi Square null distribution irrespective of the data’s nonstationarity characteristics. Our simulations involve bivariate and trivariate VARs in which we allow for the lag order to be selected by general to specific testing as well as by model selection criteria. We find that the current practice of pretesting for cointegration can result in severe over-rejections of the noncausal null while overfitting suffers less size distortion with often little loss in power.

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Paper provided by Department of Economics, University of Victoria in its series Econometrics Working Papers with number 9914.

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Length: 49 pages
Date of creation: 14 Dec 1999
Date of revision:
Handle: RePEc:vic:vicewp:9914
Note: ISSN 1485-6441
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