Research Interests  

My main area of research is theoretical statistics. This treats the foundations and properties of methods of statistical inference. I am interested in how best to use information in the data to construct inferential statements about quantities of interest. A very simple example of this is the widely quoted `margin of error' in the reporting of polls, another is the ubiquitous `p-value' reported in medical and health studies. Much of my research considers how to ensure that these inferential statements are both accurate and effective at summarizing complex sets of data. An overview of many of these ideas was provided in a 2003 Annals of Statistics paper based on the Wald Lectures to the Institute of Mathematical Statistics.

My particular focus over the last several years has been the development of extremely accurate approximations to p-values, developed from what is now called `higher order asymptotics'. I have published many papers with Don Fraser on this topic, and in 2007 Alessandra Brazzale, Anthony Davison, and I published a book called Applied Asymptotics, which aims to illustrate the application of this theoretical work on models useful for applied statistics.

All statistical research is motivated by applications, and the application area I am currently most interested in include aspects of environmental epidemiology and of high energy physics. Recently graduated PhD students Sigfrido Iglesias-Gonzalez and Ana-Maria Staicu have made important contributions to inference for longitudinal data, and in biostatistics and epidemiology, repsectively.