Warm Arctic episodes linked with increased frequency of extreme winter weather in the United States.

Nat Commun · 2018 · PMC5849726 · PMID 29535297

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highly significantno p-value reported

This has allowed us to greatly expand the degrees of freedom in analyses of relationships between PCH/PCT and severe winter weather, resulting in highly significant correlations.

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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.