Research Areas: Toxicology; medical imaging; methods in surveys, experimental design, statistical inference, computation, and graphics; arsenic in Bangladesh; radon in your basement; why it is rational to vote; why campaign polls are so variable when elections are so predictable; the effects of incumbency and redistricting; reversals of death sentences; police stops in New York City, the statistical challenges of estimating small effects; the probability that your vote will be decisive; seats and votes in Congress; and social network structure. | 
