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Co-Occurrence as a Ranking Signal

TL;DR: A little-known property of Google Books search highlights co-occurrence as a ranking signal.

The concept of co-occurrence (not to be confused with co-citation) has been on the radar of many search professionals for a while. I accepted the idea as common sense and never thought to investigate it further, then one day I stumbled into a peculiar set of search results which lead to what appears to be conclusive evidence of Google’s use of co-occurrence in their search results.…

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