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Stephen L. Hillis, PhD
Research Scientist
Biostatistician
PhD University of Iowa, 1987
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Dr. Hillis is the Senior Biostatistician with CRIISP and has considerable expertise in hierarchical multivariable modeling, ROC data analysis, and survival data analysis. Dr. Hillis has extensive experience as a consultative statistician and was formerly Director of Iowa Statistical Consulting Center and an Assistant Professor of Statistics at the American University. Dr. Hillis works closely with HSR&D investigators in planning analyses, interpreting results, assisting with manuscript development, and providing additional training for investigators.
Research Interests
ROC multi-reader multi-case methods
Hierarchical linear models
Survival analysis methods
Selected Publications
Hillis, S.L. (2007) A comparison of denominator degrees of freedom methods for multiple observer ROC analysis, Statistics in Medicine, 26:596-619 DOI: 10.1002/sim.2532.
Foreman-Hoffman, V.L., Yankey, J.W., Hillis, S.L., Wallace, R.B., Wolinsky, F.D. (2007) Weight and depressive symptoms in older adults: direction of influence, Journal of Gerontology: Social Sciences, in press.
Kaldjian, L.C., Jones, E.W., Rosenthal, G.E., Tripp-Reimer, T, Hillis, S.L. (2006) An Empirically Derived Taxonomy of Factors Affecting Physicians' Willingness to Disclose Medical Errors, Journal of General Internal Medicine, 21:942-948.
Hillis, S.L., Berbaum, K.S. (2005) Monte Carlo validation of the Dorfman-Berbaum-Metz method using normalized pseudovalues and less data-based model simplification, Academic Radiology, 12:1534-1541 DOI:10.1016/j.acra.2005.07.012.
Hillis, S.L., Obuchowski, N.A., Schartz, K.M., Berbaum, K.S. (2005) A comparison of the Dorfman-Berbaum-Metz and Obuchowski-Rockette Methods for receiver operating characteristic (ROC) data, Statistics in Medicine, in press.
Hillis, S.L., Berbaum, K.S. (2004) Power estimation for the Dorfman-Berbaum-Metz method, Academic Radiology, 11, 1260-1273.
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Contact Information
VA Iowa City Health Care System
CRIISP (152)
601 Highway 6 West
Iowa City, IA 52246-2208
Phone: 319-339-0851 x7680
E-mail: steve-hillis@uiowa.edu
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