Value-at-risk (VAR)

Component VAR for a non-normal world

It has become standard to account for non-normality when estimating portfolio value-at-risk, but there are few methods available to calculate the risk contributions of each component in a non-normal portfolio. Brian Peterson and Kris Boudt present a…

Valid Assumptions Required: backtesting

Given the large number of assumptions made in calculating a value-at-risk, how can we have confidence in the quality of the resulting calculation? Brett Humphreys looks at using backtesting to evaluate quality.

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…

A VAR, VAR better thing?

Banks reported a surge in the number of value-at-risk exceptions during the third quarter of last year following extreme turbulence in the financial markets. Are risk models breaking down? What are banks doing to fine-tune risk management practices and…

VAR counts

Rising defaults in the US subprime mortgage market, plunging prices in the credit sector and a sharp squeeze in liquidity all contributed to make the third quarter very difficult for banks. Risk compares the value-at-risk figures of the major banks in…

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