Ingroup favoritism in cooperation: a meta-analysis.

By Daniel Balliet, Junhui Wu, C. D. De Dreu. Psychological bulletin, 2014

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Discrimination in the laboratory: A meta-analysis of economics experiments (2016, methodology): “Finally, we checked our list of included studies against that of Balliet et al (2014); this step added one study (Spiegelman, 2012).3 One feature of the literature we meta-analyse is that studies tend to include various different treatments, and therefore report multiple results.”
Brain-to-Brain Synchrony Tracks Real-World Dynamic Group Interactions in the Classroom. (2017, methodology): “Classroom social dynamics were quantified in terms of socially relevant personality traits (group affinity [19, 20] and empathy [21]) and as social closeness during class interactions (between students and with the teacher; see Supplemental Experimental Procedures, section S1 for details).”