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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.

Freud, A. (1929). Business Meeting. Bul. Int. Psychoanal. Assn., 10:510-526.

(1929). Bulletin of the International Psycho-Analytic Association, 10:510-526

Business Meeting

Anna Freud

Tuesday, July 30, 1929. Morning

The President, Dr. Eitingon, opened the Business Meeting with the following address:—

There is something which distinguishes our Congress from others, whether they be of a purely scientific nature or only have some affinity to science. It is true that our Congresses are organized by an Association whose object is not merely to promote the practical application of psycho-analysis, but to foster and develop it as a science; nevertheless, from the very beginning (and especially in the initial stages, but, just as plainly, now also), our Association has been of the nature of a community with a strong, inner, quite personal cohesion. The great increase in membership cannot obliterate this characteristic, for only as a community can the International Psycho-Analytical Association fulfil the mission which is the real meaning of its existence, namely, to ensure that psycho-analysis as a whole is conserved and developed in the face of prevailing tendencies to disintegrate it and embody the fragments into other contexts and subordinate them to other, often quite alien, points of view.

[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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