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« In the Realm of Shill-dom and the Criminally Corrupt | Main | A Little Taste of When Giants Fall »

December 26, 2008

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"almost blind acceptance of an arbitrary line in the sand between recent economy history and that of the distant past" ... I like this point. Allow me to draw a parallel with risk modelling. Risk models are typically based on historical data. Risk models therefore only capture (typically recent) periods for which data are available. But it doesn't end there. Risk models often don't use all the data (in the same way), even if they are available. If we take a short-term investment horizon, historical data periods can be 'shorter' (a technical document describing 'best practice' is available at: http://www.riskmetrics.com/system/files/private/RM2006.pdf, free registration required). These are 'standard' risk models, typically used in economic capital calculations. For actual risk management, however, we try and find 'similar' periods (see e.g. http://www.riskmetrics.com/sites/default/files/Research20081100.pdf) and/or use fundamental insights (Rebonato in the latest issue of Journal of Risk Management in Financial Institutions suggests that the gradual developments in volatility can be explained by investors selling volatility to get higher yield). But this is harder, if not impossible, to put in a regulatory / control framework.

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