OvidSP: Relevancy Ranking of Results Records
How OvidSP Calculates Relevancy Ranking
When you run a search from the Basic Search mode, OvidSP uses natural language processing (NLP) to retrieve results. In the Search Results Display, OvidSP ranks Basic Search results records by relevancy to the query that produced them.
Only the records from Basic Search results
get relevancy ranked.
By default, OvidSP lists best-ranked records first in the display, providing a visual qualification of each record's relevance to your search term(s).
All search concepts are present and complete.
All search concepts are present, but some are incomplete.
One concept is missing from the record.
Two concepts are missing from the record.
More than two search concepts are missing from the record.
OvidSP ranks records in the results display based upon the following criteria.
| Count | How many search concepts appear in the record. |
| Frequency | How often concepts occur in the record. |
| Importance | How rare the terms are in the database. |
| Cohesion | Whether or not terms within phrases occur closely together. |
| Vocabulary Level | Closeness of a record's language to your word choices rather than to variants and synonyms. |
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| Limit | Allows you to incorporate a five-star limit, for example, to the search as part of the search strategy. This results in that criteria being held over to saved searches, auto-alert, and others anywhere a saved search is reused. | |
| Filter | By contrast, this is a quick and easy way for you to modify a set of results on the fly, without impacting the search strategy or auto-alert. This means that any results that do not fit the criteria are removed from the set, without a new search being performed. |
Search Aid Ranking Filter
A new search aid that allows you to essentially filter a set of results based on star rating with a single click when a Basic Search is executed. Within the Search Aids box on the left, there is an area defined as "Filter Star Ranking", which contains each level of ranking that is contained in the results set.
Upon selection of one of the check boxes, OvidSP filters the results that match that particular star ranking and displays them in the default relevance order.
In this example, a three-star rank indicates only one result which causes OvidSP to display only one result when selected.
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To display all results again, deselect the tick box(es) and OvidSP displays all the search results. |
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