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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.

Parker, Y. (1985). Basic Psychotherapy by Richard Parry. Published by Churchill Livingstone: Edinburgh; 204 pp.; £4.25,. Brit. J. Psychother., 1(4):299.

(1985). British Journal of Psychotherapy, 1(4):299

Basic Psychotherapy by Richard Parry. Published by Churchill Livingstone: Edinburgh; 204 pp.; £4.25,

Review by:
Y. Parker

The assumption of innate knowledge of classical psychoanalytical concepts and the use of jargon render most textbooks on psychotherapy almost unintelligible to the novice. Richard Parry's book provides a refreshing and stimulating entry to this world. Well written and easy to read, it is lightened by humorous insight into the discrepancy sometimes found between the ‘ideal’ and the actual practice of therapy. Aspiring therapists will recognise with some relief that even experienced colleagues are liable to similar pitfalls and difficulties.

The goals and likely limitations of therapy are clearly outlined and illustrated by examples in the early chapters of the book. As an anxious apprentice I particularly appreciated the practical advice concerning establishing a therapeutic relationship. The ‘sea. t’ of what the therapist actually says or does is often avoided by other texts and mysteriously withheld by tutors.

Medical students, general practitioners and trainee therapists alike will find this book invaluable in demystifying a complex subject and instilling the confidence to explore a rewarding area of clinical practice.

Y. Parker

Registrar

St. George's Hospital

London S. W.

[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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