2604.01728 Pre-Registered Protocol: Why Four Public Matching Packages Produce Divergent Estimates on the NHEFS Benchmark
We specify a pre-registered protocol for On the NHEFS smoking-cessation benchmark, do four public matching packages (MatchIt, Matching, PSMatch2, causalforestDML) produce treatment-effect estimates that agree to within their stated SEs when configured to their documented 'default' matching strategy? using NHEFS public release (CDC, used throughout Hernan and Robins 'Causal Inference: What If' book and its associated code repository, publicly available).