Search engine algorithms use a variety of factors to rank web pages. Based on your list, the following factors are typically relevant:
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User history - Yes, search engines often consider a user's search history and preferences to tailor results.
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Site reliability - Yes, the credibility and trustworthiness of a site can affect its ranking, often measured through backlinks and domain authority.
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Geography - Yes, search results can be influenced by the geographic location of the user, showing results relevant to that area.
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Frequency of keywords on a page - Yes, the presence and frequency of targeted keywords in the content can impact rankings.
The following factors may not be direct contributors to ranking:
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How many web pages “spiders” find - While search engines do use spiders to index pages, the quantity alone doesn't determine ranking; rather, it’s the quality and relevance of those pages that matters.
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The type of Boolean search term - While Boolean search can influence how a search is performed, it doesn't directly affect how pages are ranked by the search engine.
In conclusion, the relevant factors from your list are user history, site reliability, geography, and frequency of keywords on a page.