Tests for contagion in financial returns using correlation analysis are seriously affected by the size of the “noncrisis” and “crisis” periods. Typically the crisis period contains relatively few observations, which seriously affects the power of the test.

A dynamic latent factor model of stock market returns is estimated using simulation-based techniques. Stock market volatility is decomposed into common and idiosyncratic components, and volatility decompositions are compared between stable and turmoil periods to test for possible shift-contagion...

Tests for contagion in financial returns using correlation analysis are seriously affected by the size of the “noncrisis” and “crisis” periods. Typically the crisis period contains relatively few observations, which seriously affects the power of the test.

The existing literature suggests a number of alternative methods to test for the presence of contagion during financial market crises. This paper reviews those methods and shows how they are related in a unified framework. A number of extensions are also suggested that allow for multivariate...