This paper compares several statistical models for monthly stock return volatility. The focus is on U.S. data from 1834 … volatility that are inconsistent with stationary models for conditional heteroskedasticity, We show the importance of … of stock volatility, even over the 1834-1925 period …

It appears that volatility in equity markets is asymmetric: returns and conditional volatility are negatively … correlated. We provide a unified framework to simultaneously investigate asymmetric volatility at the firm and the market level … empirical evidence on asymmetry to Japanese stocks. Although volatility asymmetry is present and significant at the market and …

volatility …

It is sometimes argued that an increase in stock market volatility raises required stock returns, and thus lowers stock … for this volatility feedback effect. The resulting model is asymmetric, because volatility feedback amplifies large … for large crashes. The model also implies that volatility feedback is more important when volatility is high. In U …

has focused on average returns, we analyze the volatility of the returns in emerging equity markets. We characterize the … time-series of volatility in emerging markets and explore the distributional foundations of the variance process. Of … particular interest is evidence of asymmetries in volatility and the evolution of the variance process after periods of capital …

This paper examines the potential influence of changing volatility in stock market prices on the level of stock market … prices. It demonstrates that volatility is only weakly serially correlated, implying that shocks to volatility do not persist …. These shocks can therefore have only a small impact on stockmarket prices, since changes in volatility affect expected …

) levels of volatility. These results provide a novel perspective on both the equity risk premium and excess volatility puzzles …