A Variance Ratio Test of the Behaviour of Some FTSE Equity Indices Using Ranks and Signs

Authors: Belaire-Franch, Jorge¹; Opong, Kwaku²

Source: Review of Quantitative Finance and Accounting, Volume 24, Number 1, February 2005 , pp. 93-107(15)

Publisher: Springer

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Abstract:

This study utilises tests based on ranks and signs suggested by Wright (2000) in addition to the traditional variance ratio test to examine the behaviour of some UK Financial Times Stock Exchange (FTSE) stock indices. The results suggest that the null hypothesis of martingale difference behaviour of the index returns series examined in the study is rejected. The use of the nonparametric based variance ratio tests provide stronger evidence against the martingale difference behaviour than the conventional variance ratio tests, under conditions of both homoskedasticity and heteroskedasticity for the examined series. Moreover, the application of Wright’s variance ratio tests in a rolling window framework, indicates that the results for the FTSE returns are consistent neither with a linear AR assumption nor with the white noise hypothesis.

Keywords: variance ratio; heteroskedasticity; ranks; signs; random walk; martingale difference

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11156-005-5328-3

Affiliations: 1: Department of Economic Analysis, University of Valencia, Campus dels Tarongers, Avgda. dels Tarongers s/n., 46022, Valencia, Spain, Email: jorge.belaire@uv.es 2: Department of Accounting and Finance, University of Glasgow, 65-71 Southpark Avenue, Glasgow, G12 8LE, Scotland, Email: k.opong@accfin.gla.ac.uk

Publication date: 2005-02-01