Afonso, António; Gomes, Pedro; Taamouti, Abderrahim - In: Computational Statistics & Data Analysis 76 (2014) C, pp. 20-33
defined using EGARCH specifications. The estimation results show that upgrades do not have significant effects on volatility …, but downgrades increase stock and bond market volatility. Contagion is present, and sovereign rating announcements create … volatility in other countries. The empirical results show also a financial gain and risk (value-at-risk) reduction for portfolio …