The recent empirical investigation of conditional volatility in real GDP growth rates of Japan, the United Kingdom, and the United States by Hamori [Jpn. World Econ. 12 (2000) 143] finds no evidence of asymmetry. This paper re-visits the issue of asymmetric volatility using a similar approach with some modifications. We find statistically significant evidence of asymmetric volatility in the real growth rates of the United States and Canada. As such, it may be premature to conclude that business cycle indicators generally do not exhibit volatility asymmetry.
Japan and the World Economy,
Vol. 15, no. 4 (2003), pp. 437-445