Research

Research Interests

Causal Inference
Instrumental Variables
Observational Studies
Sensitivity Analysis
Applications in Public Health and Social Science

Publications and Preprints

Heng, S., O'Meara, W. P., Simmons, R. A., and Small, D. S. Relationship between changing malaria burden and low birth weight in sub-Saharan Africa. Under Revision.

Zhang, B., Heng, S., Ye, T., and Small, D. S. Social distancing and COVID-19: randomization inference for a structured dose-response relationship. Submitted.

Zhang, B., Heng, S., Mackay, E. J., and Ye, T. Bridging preference-based instrumental variable studies and cluster-randomized encouragement experiments: study design, noncompliance, and average cluster effect ratio. Under Revision.

Heng, S.*, Zhang, B.*, Han, X., Lorch, S. A., and Small, D. S. Instrumental variables: to strengthen or not to strengthen? Submitted.

Heng, S.*, Kang, H.*, Small, D. S., and Fogarty, C. B. Increasing power for observational studies of aberrant response: an adaptive approach. Under Revision.

Heng, S. and Small, D. S. Sharpening the Rosenbaum sensitivity bounds to address concerns about interactions between observed and unobserved covariates. Statistica Sinica, in press.

MacKay, E. J., Zhang, B., Heng, S., Ye, T., Neuman, M. D., Augoustides, J. G., Desai, N. D., and Groeneveld, P. W. Association between transesophageal echocardiography (TEE) and clinical outcomes after coronary artery bypass graft (CABG) surgery. Journal of the American Society of Echocardiology, in press.

Heng, S., Small, D. S., and Rosenbaum, P. R. Finding the strength in a weak instrument in a study of cognitive outcomes produced by catholic high schools. Journal of the Royal Statistical Society: Series A (Statistics in Society), 183(3), 935-958.

Sondak, D., Hawley, C., Heng, S., Vinsonhaler, R., Lauga, E., and Thiffeault, J. L. Can phoretic particles swim in two dimensions? Physical Review E, 94, 062606.

(* indicates equal contribution)