Related provisions for BIPRU 7.10.91
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A firm must have processes in place to ensure that its VaR model has been adequately validated by suitably qualified parties independent of the development process to ensure that it is conceptually sound and adequately captures all material risks. This validation must be conducted when the VaR model is initially developed and when any significant changes are made to the VaR model. The validation must also be conducted on a periodic basis but especially where there have been any
(1) In addition to regulatory backtesting programs, testing for model validation should be carried out using additional tests which may include for example:(a) testing carried out using hypothetical changes in portfolio value that would occur were end of day positions to remain unchanged;(b) testing carried out for longer periods than required for the regular backtesting programme (for example, 3 years);(c) testing carried out using confidence intervals other than the 99 percent
Backtesting conducted only at a whole portfolio level using a single measure of profit and loss has limited power to distinguish an accurate VaR model from an inaccurate one. Backtesting should therefore be regarded as an additional safeguard rather than a primary validation tool. Such testing does however form the basis of the FSA'splus factor system. The test has been chosen as the basis of the backtesting regime because of its simplicity. A firm will therefore be expected to
If a firm'sVaR model permission covers specific risk, the firm must validate its VaR model through backtesting aimed at assessing whether specific risk is being accurately captured. This backtesting must be carried out in accordance with the provisions of its VaR model permission. If the VaR model permission provides for this backtesting to be performed on the basis of relevant sub-portfolios, these must be chosen in a consistent manner.
Specific risk backtesting involves the backtesting of a standalone specific riskVaR measure against a profit and loss series determined by reference to exposure risk factors categorised as specific risk. Alternatively specific risk backtesting may take the form of regular backtesting of trading books and portfolios that are predominantly exposed to risk factors categorised as specific risk. The precise requirements for specific risk backtesting will be specified in the firm'sVaR
A firm must also perform backtesting against a clean hypothetical profit and loss figure with respect to each business day. A clean hypothetical profit and loss figure for a business day means the clean profit and loss figure that would have occurred for that business day if the portfolio on which the VaR number for that business day is based remained unchanged.
A firm must, no later than the number of business days after the end of each quarter specified in the VaR model permission for this purpose, submit, in respect of that quarter, a report to the FSA about the operation of the VaR model, the systems and controls relating to it and any changes to the VaR model and those systems and controls. Each report must outline as a minimum the following information in respect of that quarter:(1) methodological changes and developments to the