The "Social Brain," Reciprocity, and Social Network Segregation along Ethnic Boundaries.

Hum Nat · 2020 · PMC7882588 · PMID 33428108

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highly significantno p-value reported

First and foremost, both models show a strong, positive and highly significant effect of reciprocity on tie creation.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.