Heng, S. and Small, D. S. On interactions between observed and unobserved covariates in matched observational studies. 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, to appear.
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)