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Sarah Jane Ratcliffe, Ph.D.

Sarah Jane Ratcliffe, Ph.D.

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Associate Professor of Biostatistics in Biostatistics and Epidemiology at the Hospital of the University of Pennsylvania
Department: Biostatistics and Epidemiology
Graduate Group Affiliations

Contact information
Dept. of Biostatistics & Epidemiology
Univ. of Pennsylvania Perelman School of Medicine
610 Blockley Hall
Philadelphia, PA 19104-6021
Office: 2155737398
Fax: 2155734865
B.Sc(Hons) (Mathematics)
University of Technology, Sydney, Australia, 1996.
Ph.D. (Statistics)
Macquarie University, Sydney, Australia, 2000.
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Description of Research Expertise


Selected Publications

Ratcliffe SJ, Heller GZ, and Leader LR.: Functional data analysis with application to periodically stimulated fetal heart rate data. II: Functional logistic regression. Statistics in Medicine 21: 1115-27, 2002.

Ratcliffe SJ, Leader LR, and Heller GZ.: Functional data analysis with application to periodically stimulated fetal heart rate data. I: Functional regression. Statistics in Medicine 21: 1103-14, 2002.

Guo W, Ratcliffe SJ, and Ten Have TR.: A Random pattern-mixture model for longitudinal data with dropouts. Journal of the American Statistical Association 99: 929-37, 2004.

Ratcliffe SJ, Guo W,. and Ten Have TR.: Joint modeling of longitudinal and survival data via a common frailty. Biometrics 60(4): 892-9, 2004.

Shults J, Ratcliffe SJ, and Leonard M.: Improved generalized estimating equation analysis via xtqls for implementation of quasi-least squares in Stata. The Stata Journal 7(2): 147-66, 2007.

Ratcliffe SJ and Shults J: GEEQBOX: A Matlab toolbox for generalized estimating equations and quasi-least squares. Journal of Statistical Software 25(14): 1-14, 2008 Notes: url:www.jstatsoft.org/v25/i14.

Shults J, and Ratcliffe SJ: Analysis of multi-level correlated data in the framework of generalized estimating equations via xtmultcorr procedures in Stata and qls functions in Matlab. Statistics and its Interface 2: 187-96, 2009.

Calamaro CJ, Mason AT, and Ratcliffe SJ.: Adolescents living the 24/7 Lifestyle: Effects of caffeine and technology on sleep duration and daytime functioning. Pediatrics 123(6): 1005-10, 2009.

Schreiber CA, Ratcliffe SJ, Barnhart KT: A randomized controlled trial of the effect of advanced supply of emergency contraception in postpartum teens: A feasibility study. Contraception 81(5): 435-40, 2010 [Epub 2010 Feb 10] Notes: DOI: 10.1016/j.contraception.2010.01.017.

Taaffe J, Chahroudi A, Engram J, Sumpter B, Meeker T, Ratcliffe S, Paiardini M, Else J, and Silvestri G.: A five-year longitudinal analysis of naturally SIV-infected sooty mangabeys reveals a slow but progressive CD4+ T-cell decline whose magnitude is not predicted by viral load or immune activation. Journal of Virology 84(11): 5476-84, 2010 [Epub 2010 Mar 24]

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Last updated: 03/25/2014
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