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ThesaHelp: why does directed search succeed for Thesa

Thesa topic root > ThesaGroup: search with Thesa


--related--
search with Thesa
a preliminary test of directed search
how to find everything relevant to some topic or question
needle-in-a-haystack test of directed search
read-everything test of directed search
information retrieval by following links
information retrieval by relevance
information retrieval by searching

--referenced--
all Thesa topics
map of the Thesa web site

Summary

Recall is the ratio of relevant retrievals to relevant items. Precision is the ratio of relevant items to retrieved items. If a search yields a high precision ratio, it typically has a low recall ratio. The problem worsens as the size of the document collection increases. The classic paper is Blair and Maron's 1985 study of the STAIRS document-retrieval system with 350,000 pages (QuoteRef: blaiDC3_1985 ). They demonstrated that the lawyers who built the collection retrieved less that 20 percent of the relevant documents.

Thesa avoids the tradeoff between recall and precision by a directed search for relevant material. The user locates a relevant topic via keywords, and searches the neighborhood of that topic for other relevant topics. Descriptive titles make a directed search practical because the user culls titles that do not appear relevant. Related topics make directed search exhaustive because every topic is near every other topic.

Related up

ThesaHelp: a preliminary test of directed search
ThesaHelp: how to find everything relevant to some topic or question
ThesaHelp: needle-in-a-haystack test of directed search
ThesaHelp: read-everything test of directed search
Topic: information retrieval by following links
Topic: information retrieval by relevance
Topic: information retrieval by searching

Updated barberCB 4/06
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