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Volatility driven changes in stock return correlation dynamics

Johan Knif (HANKEN – Swedish School of Economics and Business Administration, Vaasa, Finland)
Seppo Pynnönen (University of Vaasa, Vaasa, Finland)

Managerial Finance

ISSN: 0307-4358

Article publication date: 20 February 2007

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Abstract

Purpose

The purpose of the paper is to study the relationship between stock return correlation and volatility.

Design/methodology/approach

Utilizing a logit‐type regression model, the paper analyzes the incremental effect of volatility on the level of correlation. The focus of the paper is set on the impact of the volatilities involved in the definition and calculation of the correlation as well as on the effects of external volatilities from other markets.

Findings

In the paper, an explicit model was constructed to investigate the contribution of the level of volatility on mutual correlations of the markets. The empirical results strongly support the findings that high volatility tends to increase correlations between the markets (see for example). An analysis of the small Nordic markets further showed that the local volatilities may play a role in the change of the level of correlation. However, it is the general world‐wide volatility level that mainly drives the changes in the correlations.

Originality/value

Particularly, the results of the paper show that market correlations tend to be dependent on the general world‐wide volatility rather than on local volatilities of single markets. This approach gives us important information about the behavior of the correlation with respect to the level of each market's risk as well as to the general global market‐risk level. The results can be directly utilized by portfolio managers in planning portfolio diversification strategies in accordance with the expected future volatility.

Keywords

Citation

Knif, J. and Pynnönen, S. (2007), "Volatility driven changes in stock return correlation dynamics", Managerial Finance, Vol. 33 No. 3, pp. 220-235. https://doi.org/10.1108/03074350710718293

Publisher

:

Emerald Group Publishing Limited

Copyright © 2007, Emerald Group Publishing Limited

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