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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.

Lagache, D. (1946). Comunicación de las actividades psicoanalíticas del Instituto de Psicología de la Universidad de Estrasburgo, trasladado a Clermont-Ferrand, de noviembre de 1940 a diciembre de 1944. Rev. psicoanál., 3(4):861-863.

(1946). Revista de Psicoanálisis, 3(4):861-863

Comunicación de las actividades psicoanalíticas del Instituto de Psicología de la Universidad de Estrasburgo, trasladado a Clermont-Ferrand, de noviembre de 1940 a diciembre de 1944

D. Lagache

Entre las dificultades con que tropieza la continuación de las actividades psicoanalíticas cabe mencionar la falta casi total de libros y revistas (es probable que la mayor parte de los libros psicoanalíticos pertenecientes a la Biblioteca del Instituto hayan sido sustraídos por los alemanes); la imposibilidad de publicar libros, y la creciente dificultad de analizar a un caso con cierta regularidad, dado que algunas veces el analista, y otras el enfermo, se ven forzados a “desaparecer”. La situación se tornó tan precaria en 1944, que el doctor Lagache únicamente pudo conservar un solo paciente y tuvo que renunciar a tomar otros enfermos.

En las conferencias teóricas de la Facultad, los conceptos psicoanalíticos continuaron oupando un amplio lugar en la enseñanza de la psicología general, de la psicología infantil, de la psicopatología, y un lugar prominente en la técnica de la psicología humana. Nunca pudimos resignarnos a ocultar el nombre de Freud, y los psicoanalistas siguieron despertando el interés más atento entre los estudiantes.

Diversas

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