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...imation, it is possible to use an Edgeworth Expansion correction to uniformly decreases the error in p-value approximation without substantially rewriting the internals. An example patch and benchmarks are available at https://github.com/ahl27/R_Patches/tree/94e8e0bcf5076841637f1031ea9cf456ad18d7ef/EdgeworthExpansion. More verbose details, examples, and benchmarks: - https://aakinshin.net/posts/r-mann-whitney-incorrect-p-value/ - https://aakinshin.net/posts/mw-edgeworth/ 2. The built-in Hodges-Lehmann estimator has some edge cases that result in incorrect answers without suitable warnings. These are detailed...