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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.

(2014). TRACCE. Psicoter. Sci. Um., 48(4):661-670.

(2014). Psicoterapia e Scienze Umane, 48(4):661-670

TRACCE

TRACCE

Edited by:
Pier Francesco Galli e Alberto Merini

Dopo una premessa di Pier Francesco Galli, in cui presenta il metodo di studio di David Rapaport (1911-1960) sulla teoria psicoanalitica e lo inquadra storicamente, vengono pubblicati per la prima volta in italiano alcuni brani dei “Seminari di metapsicologia speciale” tenuti da Rapaport nel 1957 al Western New England Institute for Psychoanalysis (New Haven, Connecticut). Viene riportata la bibliografia di riferimento (con lavori di Edward Bibring, Otto Fenichel, Merton M. Gill, Edward Glover, Heinz Hartmann, Lawrence Kubie, Francis Pasche & Michel Renard, e Thomas Szasz), l'elenco dei “problemi principali” e dei “problemi secondari”, e le prime quattro pagine dei Seminari, con interventi di David Rapaport, John P. Plunkett, Roy Schafer, Robert B. White e Virginia Suttenfield. Alla fine vi sono alcuni commenti di P.F. Galli in cui tra le altre cose parla del testo di Rapaport del 1959 Struttura della teoria psicoanalitica. Un tentativo di sistematizzazione.

[This is a summary excerpt from the full text of the journal article. The full text of the document is available to journal subscribers on the publisher's website here.]

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