Ronghui (Lily) Xu, PhD
9500 Gilman Drive, MC 0112
La Jolla, CA 92093-0112
Dr. Xu received both her Masters in Applied Mathematics (1995) and her Ph.D. in Mathematics (1996) from UCSD. She worked for one year as a graduate researcher at the UCSD Cancer Center and the Department of Mathematics before taking up an Assistant Professorship in 1997 in the Department of Biostatistics, Harvard School of Public Health and the Department of BiostatisticalScience, Dana-Farber Cancer Institute in Boston, MA. She returned to UCSD in 2004 as an Associate Professor with the Department of Family and Preventive Medicine and the Department of Mathematics. She is a recipient of David P. Byar Young Investigator Award, American Statistical Association.
Dr. Xu is Director of Design, Biostatistics and Ethics of the UCSD Clinical and Translational Research Institute (CTRI), partially funded by the NIH Clinical and Translational Science Award (CTSA). She is the lead statistician at the Organization of Teratology Information Specialists (OTIS) Collaborative Research Center, which carry out studies such as the Fetal Alcohol Spectrum Disorders Prevalence in the US and Vaccine and Medication in Pregnancy Surveillance System.
Principal Research Interests
- Survival Analysis
- Random Effects Models
- High Dimensional Data
- Clinical and Translational Research
- Reproductive Toxicology
- Xu R, O'Quigley J. Estimating average regression effect under non‑proportional hazards. Biostatistics. 2000;1:423-439.
- Vaida F, Xu R. Proportional hazards model with random effects. Stat Med. 2000;19:3309-3324.
- Xu R, Adak S. Survival analysis with time-varying regression effects using a tree-based approach. Biometrics. 2002;58:305-315.
- Xu R, Li X. Comparison of parametric versus permutation methods with applications to microarray gene expression data. Bioinformatics. 2003; 19(10): 1284-1289.
- Xu R. Measuring explained variation in linear mixed effects models. Statistics in Medicine. 2003; 22(22): 3527-3541.
- Liu I, Blacker DL, Xu R, Fitzmaurice G, Tsuang MT, Lyons MJ. Genetic and environmental contributions to the development of alcohol dependence in male twins. Archives of General Psychiatry. 2004;61: 897-903.
- Hoang T, Xu R, Schiller J, Bonomi P, Johnson D. A clinical model to predict survival in chemonaivepatients with advanced non-small cell lung cancer treated with standard chemotherapy: Eastern Cooperative Oncology Group data. Journal of Clinical Oncology. 2005;23(1): 175-183.
- Xu R, Vaida F, Harrington DP. Using profile likelihood for semiparametricmodel selection with application to proportional hazards mixed models. Statistica Sinica, 2009; 19(2): 819-842.
- Donohue MC, Haut R, Xu R, Vaida F. Conditional Akaike information under generalized linear and proportional hazards mixed models. Biometrika, 2011, doi: 10.1093/biomet/asr023.
- Xu R, Chambers C. A sample size calculation for spontaneous abortion in observational studies. Reproductive Toxicology, 2011; doi:10.1016/j.reprotox.2011.08.009.