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. Submitted.
Heng, S. and Small, D. S. Sharpening the Rosenbaum sensitivity bounds to address concerns about interactions between observed and unobserved covariates. Submitted.
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. Submitted.
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, 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)