Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/246093 
Year of Publication: 
2019
Series/Report no.: 
Working Paper No. 12/2019
Publisher: 
Norges Bank, Oslo
Abstract: 
A novel approach to inference for a specific region of the predictive distribution is introduced. An important domain of application is accurate prediction of financial risk measures, where the area of interest is the left tail of the predictive density of logreturns. Our proposed approach originates from the Bayesian approach to parameter estimation and time series forecasting, however it is robust in the sense that it provides a more accurate estimation of the predictive density in the region of interest in case of misspecification. The first main contribution of the paper is the novel concept of the Partially Censored Posterior (PCP), where the set of model parameters is partitioned into two subsets: for the first subset of parameters we consider the standard marginal posterior, for the second subset of parameters (that are particularly related to the region of interest) we consider the conditional censored posterior. The censoring means that observations outside the region of interest are censored: for those observations only the probability of being outside the region of interest matters. This quasi-Bayesian approach yields more precise parameter estimation than a fully censored posterior for all parameters, and has more focus on the region of interest than a standard Bayesian approach. The second main contribution is that we introduce two novel methods for computationally efficient simulation: Conditional MitISEM, a Markov chain Monte Carlo method to simulate model parameters from the Partially Censored Posterior, and PCP-QERMit, an Importance Sampling method that is introduced to further decrease the numerical standard errors of the Value-at-Risk and Expected Shortfall estimators. The third main contribution is that we consider the effect of using a time-varying boundary of the region of interest, which may provide more information about the left tail of the distribution of the standardized innovations. Extensive simulation and empirical studies show the ability of the introduced method to outperform standard approaches.
Subjects: 
Bayesian inference
censored likelihood
censored posterior
partially censored posterior
misspecification
density forecasting
Markov chain Monte Carlo
importance sampling
mixture of Student's t
Value-at-Risk
Expected Shortfall
Persistent Identifier of the first edition: 
ISBN: 
978-82-8379-107-5
Creative Commons License: 
cc-by-nc-nd Logo
Document Type: 
Working Paper
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