Andy Ai Ni, PhD

Assistant Professor

Andy Ai Ni, PhD


1841 Neil Ave.
280D Cunz Hall
Columbus, OH 43210


ni [dot] 304atosu [dot] edu



Dr. Ni’s main research interests are in the causal inference and individualized treatment regimen estimation with survival outcomes. He is also interested in regularized variable selection under two-stage sampling designs. He collaborates with faculty at the James Comprehensive Cancer Center and other colleges on the design and analysis of various observational studies and clinical trials.

Causal inference with survival outcomes; Individualized treatment regimen estimation with survival outcomes; High-dimensional variable selection with survival outcomes; High-dimensional variable selection with measurement error; Outcome-dependent sampling designs; 

Ph.D., Biostatistics, University of North Carolina at Chapel Hill
M.S., Biostatistics, University of Toronto

PubMed listing

† Student under my supervision


X. Guo† and A. Ni. “Contrast weighted learning for robust optimal treatment rule estimation.” Statistics in Medicine. 2022 Sep 14. Online ahead of print.

A. Ni and LX. Qin. “Performance evaluation of transcriptomics data normalization for survival risk prediction.” Briefings in Bioinformatics. 2021; 22(6): bbab257.

A. Ni, Z. Lin, and B. Lu. “Stratified restricted mean survival time model for marginal causal effect in observational survival data.” Annals of Epidemiology. 2021; 64:149-154.

A. Ni and J. Satagopan. “Estimating additive interaction effect in stratified two-phase case-control design.” Human Heredity. 2019; 84(2):90-108.

A. Ni and J. Cai. “Tuning parameter selection in Cox proportional hazards model with a diverging number of parameters.” Scandinavian Journal of Statistics. 2018; 45(3): 557-570.

A. Ni and J. Cai. “A regularized variable selection procedure in additive hazards model with stratified case-cohort design.” Lifetime Data Analysis. 2018; 24(3): 443-463.

A. Ni, J. Cai, D. Zeng. “Variable selection for case-cohort studies with failure time outcome”. Biometrika. 2016; 103 (3): 547-562. [R package


Liu J, Sheets V, Maerz R, Ni A, Magalang U, Ko CC, Firestone A. A multifactorial intervention to increase adherence to oral appliance therapy with a titratable mandibular advancement device for obstructive sleep apnea: a randomized controlled trial. Sleep Breath. 2022 Jan 11; [Epub ahead of print]

Snoke DB, Nishikawa Y, Cole RM, Ni A, Angelotti A, Vodovotz Y, Belury MA. Dietary Naringenin Preserves Insulin Sensitivity and Grip Strength and Attenuates Inflammation but AcceleratesWeight Loss in a Mouse Model of Cancer Cachexia. Mol Nutr Food Res. 2021 Nov;65(22):e2100268.

Mukherjee C, Moyer CO, Steinkamp HM, Hashmi SB, Beall CJ, Guo X, Ni A, Leys EJ, Griffen AL. Acquisition of oral microbiota is driven by environment, not host genetics. Microbiome. 2021 Feb 23;9(1):54.

Azadani EN, Peng J, Kumar A, Casamassimo PS, Griffen A, Amini H, Ni A. (2020). A survival analysis of primary second molars in children treated under general anesthesia. J Am Dent Assoc. 151(8):568-575.