Stephen Richards

I recently wrote about an objective approach to setting the value-at-risk capital for longevity trend risk. This approach is documented in Richards, Currie & Ritchie (2012), which was recently presented to a meeting of actuaries in Edinburgh.

During the public discussions of our paper on value-at-risk for longevity trend risk, one commentator asked for a fuller presentation of VaR capital requirements by age. In the paper, as with our introductory overview, we used age 70 as a representative average age of an annuity portfolio.

The Economist recently carried an article about the perceived unfairness of increasing the retirement age. The argument is that poorer people have higher mortality rates, which means they get less value from a given pension than richer people: the poor are less likely to survive long enough to receive the pension, and if they do they will draw it for a shorter period of time.

Graduation is the process whereby smooth mortality rates are created from crude mortality rates.  Smoothness is an important part of graduation, but another is the extrapolation of mortality rates to ages at which data may be unreliable or even non-existent.

A basic result in probability theory is that the variance of the sum of two random variables is not necessarily the same as the sum of their variances.

Establishing the capital requirement for longevity trend risk is a thorny problem for insurers with substantial pension or annuity payments.

We have previously shown how survival models based around the force of mortality, μx, have the ability to use more of your data.  We have also seen that attempting to use fractional years of exposure in a qx model can lead to potential mistakes. However, the Poisson distribution also uses μx, so why don't we use a Poisson model for the grouped count of deaths in each cell?

Gavin recently explored the topic of threads and parallel processing.  But what does this mean from a business perspective?

My last posting looked at why actuaries fitted survival models differently to statisticians, even though the conceptual framework for survival models is common to both disciplines.

In an earlier posting I listed some actuarial terms and their statistical equivalents (and later a short list of statistical terms and their equivalents in other fields).