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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.

Kirsch, T.B. Alto, P. (2012). The Red Book, by C. G. Jung. Also known as Liber Novus, edited and Introduced by Sonu Shamdasani. W. W. Norton, New York, 2009, 371 pp.. Psychodyn. Psych., 40(2):350-353.

(2012). Psychodynamic Psychiatry, 40(2):350-353

The Red Book, by C. G. Jung. Also known as Liber Novus, edited and Introduced by Sonu Shamdasani. W. W. Norton, New York, 2009, 371 pp.

Review by:
Thomas B. Kirsch, M.D.

Palo Alto, CA

The Red Book is based upon Jung's personal diary which he began in November 1913 and concluded in April 1914. There he recorded a series of spontaneous fantasies which had impressed themselves on his psyche and which he entered into a series of black books. Later he copied these fantasies into a large leather Red Book which he called Liber Novus, using medieval calligraphy and adding a series of paintings. The genesis of this work is described in Memories, Dreams, Reflections, Chapter 6, “Confrontation with the Unconscious.” Since the publication of this work in 1963, the public has known only of the existence of The Red Book. However, Jung had shared his inner experiences with his wife and close colleagues.

[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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