Tipton, E., Hallberg, K., Hedges, L. V., Chan, W. (2016). Implications of small samples for generalizations: Adjustments and rules of thumb. Evaluation Review (invited submission). doi:10.1177/0193841X16655665
Kang, J., Chan, W., Kim, M. O., & Steiner, P. M. (2016). Practice of causal inference with the propensity of being zero or one: Assessing the effect of arbitrary cutoffs of propensity scores. Communications for Statistical Applications and Methods, 23(1), 1–20.