I am an Assistant Member of Biostatistics in the Public Health Sciences Division,
Fred Hutchinson Cancer Research Center, and an Affiliate Assistant Professor of
Biostatistics at UW. I obtained my PhD degree in Biostatistics from the Johns Hopkins
University in 2009. 

My research interests include functional, longitudinal and multivariate data, hypothesis
testing in complex models, measurement error and latent variable models, and their
applications in public health and biomedical studies. My recent collaborative research
involves projects in the Women's Health Initiative, to investigate environmental and
genetic risk factors for cancer and cardiovascular diseases. In particular, we aim to
improve assessments of diet and physical activity through objective biomarkers and
accelerometers, and study their association with health outcomes. 



Change Point Testing in Logistic Regression Models with Interaction Term (with Youyi Fong and Sallie Permar), Statistics in Medicine (to appear) (2014)

The threshold effect takes place in situations where the relationship between an outcome variable and...



Hypothesis testing for functional linear models (with Yu-Ru Su and Li Hsu), Biometrika (submitted) (2014)

Functional data arise frequently in many biomedical studies, where it is often of interest to...



Multilevel sparse functional principal component analysis (with Ciprian Crainiceanu and Wolfgang Jank), Stat (2014)

We consider analysis of sparsely sampled multilevel functional data, where the basic observational unit is...



On Likelihood Ratio Tests When Nuisance Parameters are Present Only Under the Alternative (with Kung-Yee Liang), Statistical Science (2014)

In parametric models, when one or more parameters disappear under the null hypothesis, the likelihood...



Testing gene-environment interactions in the presence of measurement error (with Li Hsu, Charles Kooperberg, Alex Reiner, and Ross Prentice), UW Biostatistics Working Paper Series (Working Paper 405) (2014)

In genetic and genomic studies, it is important to study gene-environment interactions (GxE) in order...


Unpublished Papers

Testing treatment effect for censored time-to-event data in the presence of nonresponders (with Cheng Zheng, Gary KC Chan, Takumi Saegusa, and Ying Qing Chen), Biometrika (submitted) (2014)

In this paper, we consider the problem of testing treatment effects for censored time-to-event outcomes...