Science and was elected a fellow of the American Psychological Association in 1993. She has served on National Research Council committees on child abuse and family violence interventions and is currently a member of the Committee on Law and Justice. She has Ph.D. (psychology) and M.S. degrees from Brandeis University and a B.S. from Cornell University.

Patricia Cohen is a social psychologist-psychiatric epidemiologist at the New York State Psychiatric Institute and a faculty member at the Center for Young Children and Families, Teachers College, with a long-term interest in methodological issues. Cohen's methodological work includes the popular text Applied Multiple Regression/Correlation for the Behavioral Sciences, written with Jacob Cohen. Among her widely cited methodological articles are “To Be or Not To Be: The Control and Balancing of Type 1 And Type 2 Errors in Research” and “The Clinician's Illusion,” which demonstrates the biasing effects of sampling on one's understanding of the nature and course of disease. Her current work focuses on an empirical comparison of children in the mental health, special education, substance abuse, juvenile abuse, and social service (foster care) programs in Westchester County, NY, with regard to emotional and behavioral problems, demographic factors, and the course of their problems. She has a B.A. from Hamline University and a Ph.D. in social psychology from New York University.

Elizabeth Jane Costello is associate professor of medical psychology in the Department of Psychiatry and Behavioral Sciences at Duke University Medical Center and has been a faculty member of the department since 1988. She has served as director for the Psychiatric Epidemiology Training Program at the University of Pittsburgh School of Medicine. She is a member of the American College of Epidemiology and has served as council member and chair in the mental health section of the American Public Health Association. Costello's areas of research interest include developmental epidemiology, life-span developmental psychopathology, mental health services for children and adolescents, and clinical decision making. She has also published numerous works in refereed journals on developmental psychology and epidemiology. She has a Ph.D. in psychology from the University of London, an M.Phil, and a B.Sci. from the London School of Economics, and an M.A. from Oxford University.

Nancy A. Crowell (Study Director) is staff officer with the Commission on Behavioral and Social Sciences and Education in the National Research Council/National Academy of Sciences. She serves on the staff of the Committee of Law and Justice and the Board on Children, Youth, and Families. She was the study director for a study of the health and safety



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