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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.

Bech, E.B. (1949). Mental Health in Modern Society: By Thomas A. C. Rennie, M.D. and Luther E. Woodward, Ph.D. New York: The Commonwealth Fund, 1948. 424 pp.. Psychoanal Q., 18:245-247.

(1949). Psychoanalytic Quarterly, 18:245-247

Mental Health in Modern Society: By Thomas A. C. Rennie, M.D. and Luther E. Woodward, Ph.D. New York: The Commonwealth Fund, 1948. 424 pp.

Review by:
Elisabeth Brockett Bech

The title of this book contains an inference that it will provide a useful reference for the lay reader on the general subject of mental health. It is organized into three parts: I. Lessons from the War Period; II. Post-Emergency Problems in Mental Health; and III. Sources of Help in Treatment and Prevention. The three divisions are quite unequal in size, unlike in style and aim, perhaps due to the dual authorship.

A book written by Clara Bassett in 1934 entitled Mental Hygiene in the Community was helpful in educating the public in that decade but is now out of print and present-day interest calls for another. Do we have it in this volume? An assistant librarian in a liberal arts college gave me her opinion: 'Mental Health in Modern Society definitely is a book which could be used in the average college library. It fits into both sociology and psychology courses. The discussion of the contribution of the physician, the social worker and the psychologist is especially valuable for the layman. The fields of each are clearly defined.

[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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