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James Chromy, PhD, Senior Fellow in statistics, appointed August 2004, has over 40 years of experience in sampling theory and application, survey design, and statistical analysis. At RTI, he has led many large-scale surveys; he helped design the sample and data collection methodology for the National Assessment of Educational Progress (NAEP) first conducted by RTI in 1969 and currently serves on the NAEP Validity Studies Panel. He has experience in all aspects of area probability sampling and household interview surveys and currently serves as operational director for statistics for the National Survey on Drug Use and Health. Dr. Chromy developed the theory and computational algorithm for selecting minimum replacement probability proportional to size samples, and he developed a computer algorithm for efficient sample allocation that minimizes total survey cost subject to satisfying multiple variance constraints. He is an adjunct professor of statistics at North Carolina State University and an associate editor for the Journal of Official Statistics. | 