He has worked extensively on methods for the analysis of censored failure-time data and competing-risks problems.
Our major research activities involve the design and analysis of clinical trials and the study of related statistical issues. The Statistical Center for the Eastern Cooperative Oncology Group, headed by Dr. Gray, is involved in dozens of studies which often include biological correlative endpoints and quality-of-life evaluations, as well as evaluations of primary efficacy. Current research interests include methods of adjustment for treatment noncompliance, design and analysis of studies with competing-risks endpoints, methods for analyzing correlated failure-time data, dependent censoring (related to incomplete follow-up of disease status), issues of interim analysis of clinical data, and analysis of high-dimensional laboratory data.