Basics of quantitative risk models

Christian Meyer and Peter Quell

Before examining aspects of risk model validation in detail, this chapter will explore the task of explaining how risk can be conceptualised, and how this conceptualisation can be used to design quantitative risk models (QRMs). It starts with some historical factors concerning the evolution of quantitative risk modelling, explaining how the concept of risk is not as clearly defined as one might think, and how its perception and modelling contain many subjective aspects.

This will be followed by a description of the basic elements of QRMs, which will be relatively generic and applicable to different kinds of risk assessment problems, such as in business planning or risk management in insurance companies or the banking industry. The chapter will then explore features of risk and risk diversification that were already present in ancient times, using an historical example to pinpoint key elements. In more modern times, the development of probability theory and statistics from the late 17th Century onward provided an important context for how quantitative risk assessment could be conceptualised. The chapter will therefore start to explore the usage of statistics in QRMs and present

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