A Large Deviations Analysis of Quantile Estimation with Application to Value At Risk

Quantile estimation has become increasingly important, particularly in the nancial industry, where Value-at-Risk has emerged as a standard measurement tool for controlling portfolio risk. In this paper we apply the theory of large deviations to analyze various simulation-based quantile estimators. First, we show that the coverage probability of the standard quantile estimator converges to one exponentially fast with sample size. Then we introduce a new quantile estimator that has a provably faster convergence rate. Furthermore, we show that the coverage probability for this new estimator can be guaranteed to be 100% with su ciently large, but nite, sample size. Numerical experiments on a VaR example illustrate the potential for dramatic variance reduction.