Breaking the matches in a paired t-test for community interventions when the number of pairs is small.

By Paula Diehr, Donald C. Martin, T. Koepsell, Allen Cheadle. 1995

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The Econometrics of Randomized Experiments (2016, background): “Such quantile treatment effects have been studied in Doksum (1974) and Lehman (1974), and more recently in Abadie, Angrist and Imbens (2002), Chernozhukov and Hansen (2005), Firpo (2007), Bitler, Gelbach and Hoynes (2002).”
The Effects of High Stakes High School Achievement Awards: Evidence from a Randomized Trial (2009, unknown): “Moreover, ignoring stratification variables may lead to more precise estimates when these effects explain little of the variation in the dependent variable (Paula H. Diehr et al. 1995; Angrist and Jinyong Hahn 2004).”
A controlled trial of a critical pathway for treatment of community-acquired pneumonia. CAPITAL Study Investigators. Community-Acquired Pneumonia Intervention Trial Assessing Levofloxacin. (2000, result): “Although the institutions were matched, the matching was not considered in the analysis.(27) Since the distribution of the length of hospital stay is usually skewed with a few extreme values,(2) institutional median values were also compared.”
Issues in the meta‐analysis of cluster randomized trials (2002, background): “[47] have provided guidelines in terms of the achieved ‘matching correlation’ that may be helpful in making this decision.”