Technical paper/Risk management

Estimating credit contagion in a standard factor model

State-of-the-art credit risk portfolio models and the new Basel capital Accord consider only symmetric dependencies between borrowers in a portfolio, such as correlations. Recently, asymmetric dependencies have been introduced by Davis & Lo (2001), among…

Structural modelling of subprime mortgages

With the economy still suffering from the waves of the credit crunch, triggered by a housing price slump, Yong Kim provides a structural model of subprime mortgages based on housing market risks. Given the enormity of the subprime mortgage market failure…

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…

Looking forward to back testing

With increasing challenges to measure value-at-risk and meet high regulatory requirements, the focus has turned to back testing as a way of assuring models' adequacy. Carsten S Wehn proposes a new regime of back testing, combining state-of-the-art…

Valuing CDOs of ABSs

Charles Smithson and Neil Pearson discuss the valuation of collateralised debt obligations (CDOs), with a close look at CDOs of subprime residential mortage-backed securities

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