Rockville Institute Affiliates in
Statistical Analysis & Modeling

James Bethel, PhD
Philip Fletcher, PhD
René Gonin, PhD
Frank Jenkins, PhD
David Judkins, MA
David Marker, PhD
Debra J. Rog, PhD
David Wright, PhD
Paul L. Zador, PhD

James Bethel, PhD, is a senior statistician with research experience in health, clinical trials, education, energy, environmental research, agriculture, entitlement programs, drug abuse research, and accounting. He has worked in biostatistics, experimental design, and program evaluation. Dr. Bethel has served as the protocol statistician for many clinical trials, with responsibility for study design, data analysis, protocol development, presentations to monitoring boards, and preparation of publications. He served as the lead statistician in epidemiologic and health care studies, with responsibility for data analysis. Dr. Bethel has also designed surveys for numerous national studies and analyzed complex survey data.
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Philip Fletcher, PhD, has experience designing, coordinating, and analyzing large-scale surveys and assessments. Much of his work has been in Brazil, where he helped design the national education assessment SAEB for which he developed project specifications, test and questionnaire designs, psychometrics, and sampling, analysis, and reporting components. Dr. Fletcher develops psychometric and program evaluation resources and has extensive experience in educational assessment, Item Response Theory, scale construction, and multilevel modeling. He has undertaken a value-added analysis of longitudinal achievement data using multilevel models and has used meta-analytic techniques to monitor achievement growth of systemic initiatives.
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René Gonin, PhD, is a senior biostatistician, academician, and medical researcher with experience in medical research. He has conducted methodological, statistical, and medical research in the areas of hematology, oncology, and HIV/AIDS. He has also conducted collaborative research in dermatology, nephrology, radiology, gastroenterology, ophthalmology, and nursing (behavioral and cancer control). Dr. Gonin served as the director of Biostatistics at the Indiana University Cancer Center and was associate professor of Medicine in the Division of Biostatistics. Dr. Gonin also served concurrently as assistant professor in the Department of Biostatistics at the Harvard School of Public Health and at the Dana-Farber Cancer Institute where he was a collaborating statistician in the Eastern Cooperative Oncology Group.
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Frank Jenkins, PhD, is a senior statistician who is involved in psychometric and hierarchical linear modeling analyses projects. As a research scientist at the Educational Testing Service (ETS), he directed the analysis of mathematics, geography, and writing assessments for the National Assessment of Educational Progress. Dr. Jenkins' primary research interests include multilevel linear models and flexible Bayesian measurement models. He has consulted on research projects in a variety of educational and methodological settings.
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David Judkins, MA, is a senior statistician with extensive experience in program evaluation and the design of analysis systems for users of sample survey data. Mr. Judkins was director of statistics for an evaluation of the Office of National Drug Control Policy's National Youth Anti-Drug Media Campaign. He is a specialist in designing analysis systems that automate tasks previously handled by custom specifications and programming. He has taken a lead role in developing systems for imputation of partial questionnaires, nonresponse adjustment, propensity scoring for casual inference from observational studies, variance estimation, and table preparation. Mr. Judkins is also an expert in multilevel modeling, survival analysis, and small-area estimation.
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David Marker, PhD, is a senior statistician with expertise in project management, quality control and improvement, survey research, sampling, survey evaluation, data analysis, imputation, modeling, and small area statistics. Dr. Marker has worked on studies in the fields of health, the environment, education, housing, energy, social services, insurance, and transportation, as well as in the commercial sector. He has also appeared as an expert witness before Federal, state, and local governments. Dr. Marker has worked on studies in the area of quality control and improvement for the U.S. Department of Education, the Energy Information Administration, and the U.S. Environmental Protection Agency. He is an internationally recognized consultant in total quality management, having been invited to conduct training sessions for the Swedish, Norwegian, and Finnish governments on improving the quality of their data collection activities. He has also conducted audits of statistical offices in South Africa, Denmark, and The Netherlands. Dr. Marker is also a member of the Board of Directors of the American Statistical Association and Chair of its Scientific and Public Affairs Advisory Committee.
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Debra J. Rog, PhD, has extensive experience in program evaluation research and applied social research, and is known for her expertise in homelessness. She has managed a number of multisite research and evaluation projects in the areas of poverty, homelessness, housing for vulnerable populations, mental health, and applied research methodology. Dr. Rog recently has led a series of evaluability assessments of childhood obesity prevention projects for the Robert Wood Johnson Foundation. She has provided project management and subject-matter expertise for research funded by clients such as the Robert Wood Johnson Foundation, the Center for Mental Health Services, the National Institute of Mental Health, the Substance Abuse and Mental Health Services Administration, the National Mental Health Association, and the Bill and Melinda Gates Foundation, among others. Dr. Rog has published and presented widely on mental health treatment issues, program evaluation, and applied research methodological topics and is a recognized expert in evaluation methodology, homelessness, and mental health. She is an editor on numerous books, series, and journals. Dr. Rog is also the President of the American Evaluation Association.
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David Wright, PhD, is a senior biostatistician with experience in clinical trials, sample design, multivariate analysis, epidemiologic modeling, and industrial consulting. His experience spans all aspects of clinical trials, from protocol development and analysis plans to statistical programming and writing for publications. Dr. Wright's work also encompasses research issues that are not strictly statistical, such as data management and total quality management. Among his past work are projects to design and analyze national surveys and to apply generalized estimating equation models for analysis of clinical trials. Nonparametric methods, experimental design, survival analysis, modeling of longitudinal data, and operations research are among Dr. Wright's areas of specialization.
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Paul L. Zador, PhD, is a senior statistician and design methodologist with experience in collaborative, interdisciplinary research. His ongoing research includes a range of studies: developing and implementing a propensity modeling-based strategy for the evaluation of Youth Opportunity Grants; developing and applying statistical techniques to measure the causal impact of a national media campaign against substance abuse among youth; developing methodology aimed at model-based estimates of the incidence of child abuse and neglect; evaluating the effectiveness of breath alcohol ignition interlock devices in reducing recidivism among repeat alcohol offenders in Maryland; and evaluating an initiative to improve geriatric social work training.
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