Effect modification occurs if a treatment effect is larger or more stable in certain subgroups defined by observed covariates. The submax or subgroup-maximum method of Lee et al. (2017) <arXiv:1702.00525> does an overall test and separate tests in subgroups, correcting for multiple testing using the joint distribution.
The DESCRIPTION file:
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The main function is submax(). Also helpful is score(). See their documentation.
Paul R. Rosenbaum
Maintainer: Paul R. Rosenbaum <[email protected]>
Lee, K., Small, D. S., & Rosenbaum, P. R. (2017). A new, powerful approach to the study of effect modification in observational studies. arXiv preprint arXiv:1702.00525.
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