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Evaluating Value at Risk Methodologies

Evaluating Value at Risk Methodologies
Author: Matt Pritsker
Publisher:
Total Pages:
Release: 1998
Genre:
ISBN:

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Recent research has shown that different methods of computing Value at Risk (VAR) generate widely varying results, suggesting the choice of VAR methods is very important. This paper examines six VAR methods, and compares their computational time requirements and their accuracy when the sole source of inaccuracy is errors in approximating nonlinearity. Simulations using portfolios of foreign exchange options show showed fairly wide variation in accuracy and unsurprisingly wide variation in computational time. When the computational time and the accuracy of the methods were examined together, four methods were superior to the others. The paper also presents a new method for using order statistics to create confidence intervals for the errors and errors as a percent of true value at risk for each VAR method. This makes it possible to easily interpret the implications of VAR errors for the size of shortfalls or surpluses in a firm's risk based capital.


Value at Risk Methodologies

Value at Risk Methodologies
Author: Simin Dong
Publisher:
Total Pages: 88
Release: 2006
Genre: Financial risk managment
ISBN:

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Value at Risk (VaR) is a useful concept in risk disclosure, especially for financial institutions. In this paper, the origin and development as well as the regulatory requirement of VaR are discussed. Furthermore, a hypothetical foreign currency forward contract is used as an example to illustrate the implementation of VaR. Back testing is conducted to test the soundness of each VaR model. Analysis in this paper shows that historical simulation and Monte Carlo simulation approaches have more advantages than the delta-normal approach based on the fact that these two approaches capture the option involved portfolio features and pass three back testing models which are used to test the soundness of the VaR models.


Evaluation of Value at Risk Models

Evaluation of Value at Risk Models
Author: P.A. Naidu
Publisher: LAP Lambert Academic Publishing
Total Pages: 140
Release: 2013
Genre:
ISBN: 9783659483769

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This book gives an overview of evaluation of the most widespread Value at Risk (VaR)Models in use in most of risk management departments across the financial industry.Value at Risk (VaR) has become the standard measure that financial analysts use to quantify market risk. VaR is defined as the maximum potential change in value of a portfolio of financial instruments with a given probability over a certain horizon. VaR measures can have many applications, such as in risk management, to evaluate the performance of risk takers and for regulatory requirements, and hence it is very important to develop methodologies that provide accurate estimates.The main objective of this book is to survey the most popular univariate VaR methodologies, paying particular attention to their underlying assumptions. The great popularity that this instrument has achieved is essentially due to its conceptual simplicity: VaR reduces the (market) risk associated with any portfolio to just one number, the loss associated to a given probability. VaR can also be applied to governance of endowments, trusts, and pension plans. Essentially trustees adopt portfolio VaR metrics for the entire pooled account.


An Introduction to Value-at-Risk

An Introduction to Value-at-Risk
Author: Moorad Choudhry
Publisher: John Wiley & Sons
Total Pages: 194
Release: 2007-01-11
Genre: Business & Economics
ISBN: 0470033770

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The value-at-risk measurement methodology is a widely-used tool in financial market risk management. The fourth edition of Professor Moorad Choudhry’s benchmark reference text An Introduction to Value-at-Risk offers an accessible and reader-friendly look at the concept of VaR and its different estimation methods, and is aimed specifically at newcomers to the market or those unfamiliar with modern risk management practices. The author capitalises on his experience in the financial markets to present this concise yet in-depth coverage of VaR, set in the context of risk management as a whole. Topics covered include: Defining value-at-risk Variance-covariance methodology Monte Carlo simulation Portfolio VaR Credit risk and credit VaR Topics are illustrated with Bloomberg screens, worked examples, exercises and case studies. Related issues such as statistics, volatility and correlation are also introduced as necessary background for students and practitioners. This is essential reading for all those who require an introduction to financial market risk management and value-at-risk.


Implementing Value at Risk

Implementing Value at Risk
Author: Philip Best
Publisher: John Wiley & Sons
Total Pages: 224
Release: 2000-11-21
Genre: Business & Economics
ISBN: 0470865962

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Implementing Value at Risk Philip Best Value at Risk (VAR) is an estimate of the potential loss on a trading or investment portfolio. Its use has swept the banking world and is now accepted as an essential tool in any risk manager's briefcase. Perhaps the greatest strength of VAR is that it can cope with virtually all financial products, from simple securities through to complex exotic derivatives. This allows the risk taken, across diverse trading activities, to be compared. This said, VAR is no panacea. It is as critical to understand when the use of VAR is inappropriate as it is to understand the value VAR can add to a bank's understanding and control of its risks. This book aims to explain how VAR can be used as an integral part of a risk and business management framework, rather than as a stand-alone tool. The objectives of this book are to explain: What VAR is - and isn't! How to calculate VAR - the three main methods Why stress testing is needed to complement VAR How to make stress testing effective How to use VAR and stress testing to manage risk How to use VAR to improve a bank's performance VAR as a regulatory measure of risk and capital Risk management practitioners, general bank managers, consultants and students of finance and risk management will find this book, and the software package included, an invaluable addition to their library. Finance/Investment


Methods for Evaluating Value-at-Risk Estimates

Methods for Evaluating Value-at-Risk Estimates
Author: Jose A. Lopez
Publisher:
Total Pages: 6
Release: 2007
Genre:
ISBN:

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As implemented in the United States, the market risk amendment to the Basle Capital Accord requires that commercial banks with significant trading activity provide their regulators with VaR estimates from their own internal models. The VaR estimates will be used to determine the banks' market risk capital requirements. This development clearly indicates the importance of evaluating the accuracy of VaR estimates from a regulatory perspective.


Value at Risk, 3rd Ed.

Value at Risk, 3rd Ed.
Author: Philippe Jorion
Publisher: McGraw Hill Professional
Total Pages: 624
Release: 2006-11-09
Genre: Business & Economics
ISBN: 0071736921

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Since its original publication, Value at Risk has become the industry standard in risk management. Now in its Third Edition, this international bestseller addresses the fundamental changes in the field that have occurred across the globe in recent years. Philippe Jorion provides the most current information needed to understand and implement VAR-as well as manage newer dimensions of financial risk. Featured updates include: An increased emphasis on operational risk Using VAR for integrated risk management and to measure economic capital Applications of VAR to risk budgeting in investment management Discussion of new risk-management techniques, including extreme value theory, principal components, and copulas Extensive coverage of the recently finalized Basel II capital adequacy rules for commercial banks, integrated throughout the book A major new feature of the Third Edition is the addition of short questions and exercises at the end of each chapter, making it even easier to check progress. Detailed answers are posted on the companion web site www.pjorion.com/var/. The web site contains other materials, including additional questions that course instructors can assign to their students. Jorion leaves no stone unturned, addressing the building blocks of VAR from computing and backtesting models to forecasting risk and correlations. He outlines the use of VAR to measure and control risk for trading, for investment management, and for enterprise-wide risk management. He also points out key pitfalls to watch out for in risk-management systems. The value-at-risk approach continues to improve worldwide standards for managing numerous types of risk. Now more than ever, professionals can depend on Value at Risk for comprehensive, authoritative counsel on VAR, its application, and its results-and to keep ahead of the curve.


Financial Risk Forecasting

Financial Risk Forecasting
Author: Jon Danielsson
Publisher: John Wiley & Sons
Total Pages: 307
Release: 2011-04-20
Genre: Business & Economics
ISBN: 1119977118

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Financial Risk Forecasting is a complete introduction to practical quantitative risk management, with a focus on market risk. Derived from the authors teaching notes and years spent training practitioners in risk management techniques, it brings together the three key disciplines of finance, statistics and modeling (programming), to provide a thorough grounding in risk management techniques. Written by renowned risk expert Jon Danielsson, the book begins with an introduction to financial markets and market prices, volatility clusters, fat tails and nonlinear dependence. It then goes on to present volatility forecasting with both univatiate and multivatiate methods, discussing the various methods used by industry, with a special focus on the GARCH family of models. The evaluation of the quality of forecasts is discussed in detail. Next, the main concepts in risk and models to forecast risk are discussed, especially volatility, value-at-risk and expected shortfall. The focus is both on risk in basic assets such as stocks and foreign exchange, but also calculations of risk in bonds and options, with analytical methods such as delta-normal VaR and duration-normal VaR and Monte Carlo simulation. The book then moves on to the evaluation of risk models with methods like backtesting, followed by a discussion on stress testing. The book concludes by focussing on the forecasting of risk in very large and uncommon events with extreme value theory and considering the underlying assumptions behind almost every risk model in practical use – that risk is exogenous – and what happens when those assumptions are violated. Every method presented brings together theoretical discussion and derivation of key equations and a discussion of issues in practical implementation. Each method is implemented in both MATLAB and R, two of the most commonly used mathematical programming languages for risk forecasting with which the reader can implement the models illustrated in the book. The book includes four appendices. The first introduces basic concepts in statistics and financial time series referred to throughout the book. The second and third introduce R and MATLAB, providing a discussion of the basic implementation of the software packages. And the final looks at the concept of maximum likelihood, especially issues in implementation and testing. The book is accompanied by a website - www.financialriskforecasting.com – which features downloadable code as used in the book.


Science and Judgment in Risk Assessment

Science and Judgment in Risk Assessment
Author: National Research Council
Publisher: National Academies Press
Total Pages: 668
Release: 1994-01-01
Genre: Science
ISBN: 030904894X

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The public depends on competent risk assessment from the federal government and the scientific community to grapple with the threat of pollution. When risk reports turn out to be overblownâ€"or when risks are overlookedâ€"public skepticism abounds. This comprehensive and readable book explores how the U.S. Environmental Protection Agency (EPA) can improve its risk assessment practices, with a focus on implementation of the 1990 Clean Air Act Amendments. With a wealth of detailed information, pertinent examples, and revealing analysis, the volume explores the "default option" and other basic concepts. It offers two views of EPA operations: The first examines how EPA currently assesses exposure to hazardous air pollutants, evaluates the toxicity of a substance, and characterizes the risk to the public. The second, more holistic, view explores how EPA can improve in several critical areas of risk assessment by focusing on cross-cutting themes and incorporating more scientific judgment. This comprehensive volume will be important to the EPA and other agencies, risk managers, environmental advocates, scientists, faculty, students, and concerned individuals.