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Tip: Understanding Rank

PEP-Web Tip of the Day

When you do a search, you can sort the results bibliographically alphabetical or by “rank”. What is Rank?

Rank refers to the search engine’s “best guess” as to the relevance of the result to the search you specified. The exact method of ranking used varies a bit depending on the search. In its most basic level, when you specify a single search term, rank looks at the density of the matches for the word in the document, and how close to the beginning of the document they appear as a measure of importance to the paper’s topic. The documents with the most matches and where the term is deemed to have the most importance, have the highest “relevance” and are ranked first (presented first).

When you specify more than one term to appear anywhere in the article, the method is similar, but the search engine looks at how many of those terms appear, and how close together they appear, how close to the beginning of the document, and can even take into account the relative rarity of the search terms and their density in the retrieved file, where infrequent terms count more heavily than common terms.

To see a simple example of this, search for the words (not the phrase, so no quotes):

unconscious communications

Look at the density of matches in each document on the first page of the hits. Then go to the last page of matched documents, and observe the density of matches within the documents.

A more complex search illustrates this nicely with a single page and only 15 matches:

counter*tr* w/25 “liv* out” w/25 enact*

There are a lot of word forms and variants of the words (due to the * wildcards) above that can match, but the proximity (w/25) clause limits the potential for matching. What’s interesting here though is how easily you can see the match density decrease as you view down the short list.

The end result of selecting order by rank is that the search engine’s best “guess” as to which articles are more relevant appear higher on the list than less relevant articles.

For the complete list of tips, see PEP-Web Tips on the PEP-Web support page.

Millard, D.W. (1987). Dictionary of Psychotherapy compiled by Sue Walrond-Skinner. Published by Routledge and Kegan Paul: London 1986; 379 pages; £30.00.. Brit. J. Psychother., 4(1):108-110.

(1987). British Journal of Psychotherapy, 4(1):108-110

Dictionary of Psychotherapy compiled by Sue Walrond-Skinner. Published by Routledge and Kegan Paul: London 1986; 379 pages; £30.00.

Review by:
D. W. Millard

How does one begin to judge the value of a reference book? Such books come in an astonishing variety of styles, serving a variety of purposes for a variety of users. They range from, say, one's personal address book through the telephone directory to a host of almanacs, dictionaries, thesauruses and the like, and onwards to monuments such as Encyclopaedia Britannica So a reviewer of the Dictionary of Psychotherapy must perhaps content himself with comments on its structure and style in relation to the purposes and users for whom it is evidently intended.

The dictionary provides about 850 entries, each typically in the form of one or more paragraphs describing the use of the term and setting it into its conceptual context.

[This is a summary or excerpt from the full text of the book or article. The full text of the document is available to subscribers.]

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