decompositions, derives a network risk model for a portfolio of assets. As a normalized measure of the sum of variance contributions … deriving the network risk model, the portfolio covariance matrix is decomposed to obtain the network-driven component of the … both the variance and covariance decompositions. In a third step, using quantile regressions, the proposed network risk …

We define risk spillover as the dependence of a given asset variance on the past covariances and variances of other … assets. Building on this idea, we propose the use of a highly flexible and tractable model to forecast the volatility of an … international equity portfolio. According to the risk management strategy proposed, portfolio risk is seen as a specific combination …

The situation of a limited availability of historical data is frequently encountered in portfolio risk estimation …, especially in credit risk estimation. This makes it, for example, difficult to find temporal structures with statistical …-portfolio specific volatility indices called portfolio risk drivers. The dynamics of the risk drivers are modelled by multiplicative …