Robust Transformations in Univariate and Multivariate Time Series

Marco Riani

Econometric Reviews, 2009, vol. 28, issue 1-3, 262-278

Abstract: It is well known that transformation of the response may improve the homogeneity and the approximate normality of the errors. Unfortunately, the estimated transformation and related test statistic may be sensitive to the presence of one, or several, atypical observations. In addition, it is important to remark that outliers in one transformed scale may not be atypical in another scale. Therefore, it is important to choose a transformation which does not depend on the presence of particular observations. In this article we suggest an efficient procedure based on a robust score test statistic which quantifies the effect of each observation on the choice of the transformation.

Keywords: Fan plot; Forward search; Kalman filter; Outlier detection; Robust methods; Score test (search for similar items in EconPapers)
Date: 2009
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Citations: View citations in EconPapers (2)

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DOI: 10.1080/07474930802388074

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