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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, S. (1900). VII: ZUR PSYCHOLOGIE DER TRAUMVORGĂ„NGE. GESAMMELTE WERKE: II/III, 513-626.

Freud, S. (1900). [GWB513a1]VII: ZUR PSYCHOLOGIE DER TRAUMVORGÄNGE. GESAMMELTE WERKE: II/III, 513-626

[GWB513a1]VII: ZUR PSYCHOLOGIE DER TRAUMVORGÄNGE Book Information Previous Up Next

Sigm. Freud

[GWB513a2]Unter den Träumen, die ich durch Mitteilung von seiten anderer erfahren habe, befindet sich einer, der jetzt einen ganz besonderen Anspruch auf unsere Beachtung erhebt. Er ist mir von einer Patientin erzählt worden, die ihn selbst in einer Vorlesung über den Traum kennen gelernt hat; seine eigentliche Quelle ist mir unbekannt geblieben. Jener Dame aber hat er durch seinen Inhalt Eindruck gemacht, denn sie hat es nicht versäumt, ihn “nachzuträumen”, d. h. Elemente des Traums in einem eigenen Traum zu wiederholen, um durch diese Übertragung eine Übereinstimmung in einem bestimmten Punkte auszudrücken.

[GWB513a3]Die Vorbedingungen dieses vorbildlichen Traumes sind folgende: Ein Vater hat Tage und Nächte lang am Krankenbett seines Kindes gewacht. Nachdem das Kind gestorben, begibt er sich in einem Nebenzimmer zur Ruhe, läßt aber die Tür geöffnet, um aus seinem Schlafraum in jenen zu blicken, worin die Leiche des Kindes aufgebahrt liegt, von großen Kerzen umstellt. Ein alter Mann ist zur Wache bestellt worden und sitzt neben der Leiche, Gebete murmelnd.

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