Abstract
In his Nobel Laureate lecture Engle notes that asymmetric volatility has a significant impact on risk. In this article equity market volatility is estimated using an asymmetric power-GARCH model which nests many other popular models. We estimate the magnitude of asymmetric volatility for several emerging and mature markets for three sub-periods. Many mature markets exhibit large magnitudes of asymmetric volatility and several emerging markets do so as well. The magnitude of asymmetry varies by sub-period and is consistent with the suggestion in Campbell and Hentschel (1992) that asymmetry is greater when markets are more volatile.
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