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NavigatorSearch employs a comprehensive relevance ranking strategy that utilizes numerous criteria, including frequency of your entered search terms. Like all search engines, NavigatorSearch begins by finding records that contain the words that match your search query. Some matching fields (e.g., subject heading and title) are considered more important than others for relevance scoring purposes and are weighted to take advantage of their relative importance. 

Specific content attributes of matching records may also contribute to relevance scoring. For example, NavigatorSearch will prioritize the ranking of newly published records and peer-reviewed records over older and non-peer-reviewed equivalents.

For additional details, please see the following EBSCO Help page:

How is relevance ranking determined in EBSCO Discovery Service (EDS)?