The Ph.D. program is administered by an active, expanding and highly interdisciplinary faculty in the Department of Biostatistics. Major areas of research activity include Bayesian inference, analysis of biomarkers and diagnostic tests, causal inference and missing data, time series and functional data analysis, modeling of social networks, bioinformatics, longitudinal data, and multilevel modeling. Faculty collaborate actively with investigators in the areas of cancer prevention and screening, behavioral sciences, HIV/AIDS, health care policy, genetic epidemiology, neuroscience, and genomics. Biostatistics faculty are members of the Center for Statistical Sciences (CSS) or the Center for Evidence Based Medicine. CSS hosts the Biostatistics Center for NCI–funded American College of Radiology Imaging Network (ACRIN), the Biostatistics Core for Brown's Center for AIDS Research (CFAR), and the Biostatistics Core for Brown's multidisciplinary Alcohol Research Center for HIV (ARCH).