Here we bring together the segments of the popular series authored by John Major, which focuses on the issues and challenges in managing catastrophe model uncertainty.
Managing Catastrophe Model Uncertainty, Issues and Challenges: Part I, Executive Summary: Uncertainty is ever present in the insurance business, and despite relentless enhancements in data gathering and processing power, it is still a large factor in risk modeling and assessment. This realization, driven home by model changes and recent unexpected natural catastrophes, can be disconcerting - even frightening - to industry participants. But companies that understand the vagaries of model uncertainty and take a disciplined, holistic approach to managing the catastrophe modeling process are well positioned to adapt and outperform the competition.
Managing Catastrophe Model Uncertainty, Issues and Challenges: Part II, Natural Cat Modeling, Uncertainty in Cat Model Results: Computerized simulation modeling of the potential impact and risk of natural disasters - from multiple perils - was pioneered by Dr. Don G. Friedman at the Travelers Insurance Company in the 1960s. Figure 2, below, is an example of one of his simulated wind speed maps, circa 1974. In 1987, Karen Clark founded the first cat modeling firm, AIR, and three more firms, RMS, EQECAT and ARA, came on the scene in 1988, 1994 and 1999, respectively. By the early 1990s Guy Carpenter had become a “power user” of cat models and augmented its capabilities by acquiring the intellectual property - and hiring some colleagues of the retiring Dr. Friedman.
Managing Catastrophe Model Uncertainty, Issues and Challenges: Part III, Using Cat Models: Scenario analysis has a long history in risk management. By examining a set of hypothetical extreme events and asking “what if this were to happen?” management can begin to get a sense of vulnerabilities in the business. But it is hard to assess how realistic a particular scenario might be. Using historical events as the basis for scenarios incorporates the fact that those events did, in fact, occur. They are realistic by definition. And their relative occurrence over time gives a sense of probability.
Managing Catastrophe Model Uncertainty, Issues and Challenges: Part IV, How Guy Carpenter Can Help: As Karen Clark, founder of AIR and now an independent consultant, has said, “the black box started out as a useful tool for decision making, but then it grew to be very big and very powerful; the black box now makes the decisions.” While somewhat hyperbolic, there is also much truth to this aphorism. Models are tools, and a good tool user understands the strengths and limitations of the tool.