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Our main objective is to clarify a number of well\u2010known claims about the practice of dropping pairs with an attrited unit when analyzing matched\u2010pair designs. Contradictory advice appears in the literature about whether or not dropping pairs is beneficial or harmful, and stratifying into larger groups has been recommended as a resolution to the issue. To address these claims, we derive the estimands obtained from the difference\u2010in\u2010means estimator in a matched\u2010pair design both when the observations from pairs with an attrited unit are retained and when they are dropped. We find limited evidence to support the claims that dropping pairs helps recover the average treatment effect, but we find that it may potentially help in recovering a convex\u2010weighted average of conditional average treatment effects. We report similar findings for stratified designs when studying the estimands obtained from a regression of outcomes on treatment with and without strata fixed effects.<\/jats:p>","DOI":"10.1002\/jae.3025","type":"journal-article","created":{"date-parts":[[2023,12,21]],"date-time":"2023-12-21T05:40:20Z","timestamp":1703137220000},"page":"256-268","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Revisiting the analysis of matched\u2010pair and stratified experiments in the presence of attrition"],"prefix":"10.1002","volume":"39","author":[{"given":"Yuehao","family":"Bai","sequence":"first","affiliation":[{"name":"Department of Economics University of Southern California  Los Angeles California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8382-5352","authenticated-orcid":false,"given":"Meng Hsuan","family":"Hsieh","sequence":"additional","affiliation":[{"name":"Ross School of Business University of Michigan  Ann Arbor Michigan USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jizhou","family":"Liu","sequence":"additional","affiliation":[{"name":"Booth School of Business University of Chicago  Chicago Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Max","family":"Tabord\u2010Meehan","sequence":"additional","affiliation":[{"name":"Department of Economics University of Chicago  Chicago Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,12,20]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1257\/aer.20190586"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1257\/aer.99.4.1384"},{"issue":"2","key":"e_1_2_7_4_1","first-page":"121","article-title":"Deposit collectors","volume":"5","author":"Ashraf N.","year":"2006","journal-title":"Advances in Economic Analysis & Policy"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1257\/aer.20150183"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1257\/aer.20201856"},{"key":"e_1_2_7_7_1","unstructured":"Bai Y. 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