Portfolio risk measures such as Value at Risk is traditionally measured using a buy and hold assumption on the portfolio. In particular the 10-day market risk capital is commonly measured as the 1-day Value at Risk scaled by the square root of 10. While this scaling is convenient to obtain n-day...

Using stock data that covers the period from 6th April 2001 to 17th June 2009, including data for the recent crisis period, we perform Value at Risk risk model validation by backtesting the performance of VaR models in predicting future losses of a portfolio of stocks, futures and options. The...