Summon's relevance ranking algorithm assigns weights to search terms according to the importance of the terms, approximated by a logarithmically scaled inverse of the document frequency (i.e., the number of documents that contain a term) in the entire Central Discovery Index. As a result, infrequent/rare terms are weighted higher than frequent/common terms.

The "^" operator allows the modifications of the relevance weights of search terms, phrases, fielded searches or Boolean expressions. The format is term^multiplier or expression^multiplier. For example, the multiplier of 2 doubles the original weight, and the multiplier of 0.5 halves the original weight. When the "^" operator is used with a multi-term phrase or expression, the multiplier is applied to all of the terms in the phrase or expression.

Examples:

• yoruba books^2
• "american history"^1.5 introduction
• (cats OR dogs)^5 AND raccoons
• Title:jazz^0.5 Author:(Jamey Aebersold)^2

Please note that the "^" operator cannot be used within double quotes (e.g., "cats^2 dogs"). In such cases, the "^" operator and the multiplier are interpreted literally as part of the term.

• Date Created: 9-Feb-2014
• Last Edited Date: 24-Mar-2017
• Old Article Number: 8790