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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.

Napolitano, F. (1990). Comparability in Psychoanalysis. Rivista Psicoanal., 36(1):96-122.

(1990). Rivista di Psicoanalisi, 36(1):96-122

Comparability in Psychoanalysis Language Translation

Francesco Napolitano

The problem of the comparability of scientific data first makes its mark with full import in the Ancient Greek world, with the discovery of the irrationally of the square root of two. The incommensurability (i.e. the lack of a common unit of measure) that the Pythagoreans discovered as existing between the side and the diagonal of the unit square consists in the incomparability of side and diagonal when using the logical relations that yield rational numbers. Given the previous belief that these relations were capable of generating all numbers, the discovery of new and strange numbers (now called “irrational”) that bear no logical relation with any known number was disquieting. The doxographers convey a tremor of this disquiet, which was potent enough to split the Pythagoreans irreversibly into two opposing currents. The first saw the discovery of incomparability as the categoric downfall of religious and scientific rationality and therefore believed that the discovery should remain the secret of a small number of initiates.

[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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