Estimating search engine index size variability: a 9-year longitudinal study.

Scientometrics · 2016 · PMC4833824 · PMID 27122648

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an overall trendno p-value reported

Overall, this analysis of the intrinsic variability of the components of the average estimate indicate that the individual words follow an overall trend; Google is reporting document counts that go up and down over time for all words simultaneously.

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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.