Technical paper
Modelling default rate in a retail portfolio and the estimation of portfolio risk
Considering correlation as the major driving factor for portfolio risk, Farshad Mashayekhi and Joy Wang present a methodology for the estimation of correlation among retail exposures based on historical default rates in pools of retail accounts. The…
Geometric mean variance
It is argued that a constrained mean variance framework is superior to Black-Litterman asset allocation, and can help an investor determine the mean excess return vector given their market views
Market-implied Archimedean copulas
Computations of implied copulas are a central element in producing loss distributions of bespoke portfolios and pricing their tranches. This process is made feasible by the availability of index tranche pricing data. Luigi Vacca shows how it is possible…
Confidence intervals for corporate default rates
Rating agency default studies provide estimates of mean default rates over multiple time horizons but have never included estimates of the standard errors of the estimates. This is due at least in part to the challenge of accounting for the high degree…
A trick of the credit tail
Credit derivatives
Interest rate risk of mortgage servicing rights
Dick Boswinkel and Kent Westerbeck examine the behaviour of mortgage servicing rights' duration and convexity and explain how they relate to the prepayment assumptions used in valuing MSRs
Future mortality improvements in the ^G7 countries
Technical papers
Kalibrierung der Laufzeitstrukturen der Ausfallwahrscheinlichkeiten
Der Neueste Stand: Kreditrisiko