The measurement of concentration risk in credit portfolios is necessary for the determinationof regulatory capital under Pillar 2 of Basel II as well as for managing portfolios and allocating economiccapital. Existing multi-factor models that deal with concentration risk are often inconsistent...

A non-stationary regression model for financial returns is examined theoretically in this paper.Volatility dynamics are modelled both exogenously and deterministic, captured by a nonparametriccurve estimation on equidistant centered returns. We prove consistency and asymptotic normalityof a...

In this paper we first investigate the validity of a general Value at Risk approach, which iswidely used for risk management in banking and insurance companies. We discuss and widely rejectthe conventional assumptions, e.g. independent identically distributed normal returns, and as...