I enjoy working on causal inference in randomized experiments.
We think in terms of what would happen (potential outcomes), and what could have happened (counterfactuals).
Loh, W. W., & Richardson, T. S. (2015).
A Finite Population Likelihood Ratio Test of the Sharp Null Hypothesis for Compliers.
In Thirty-First Conference on Uncertainty in Artificial Intelligence.
Loh, W. W., & Richardson, T. S. (2013).
A Finite Population Test of the Sharp Null for Compliers.
In UAI Workshop on Approaches to Causal Structure Learning, 15 July, Bellevue, Washington.