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Use this tool to learn about websites, specifically the one you just entered.
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Searching and Indexing
This is just a sample of the content found on this website. Please visit the website to read the entire page.
"Searching and Indexing
Table of Contents
Introduction
Design Space
Systems
Introduction
To locate information in the WWW by any means other than naive
hyperlink traversal requires the use of an index or some sort
of query capability. These two topics are closely related, since
an index can be thought of as a cached query, and indeed, many
indices are created by using web crawlers that have much in common
with query engines (e.g., similar traversal strategies and building
of temporary indices). Further, some indices allow queries to
be applied to their contents, while others simply are organized
collections of hyperlinks.
Regardless of style, locating information in a document space
(in this case the WWW) ultimately partitions the document space
into two partitions: documents retrieved and documents not retrieved.
Each of these partitions may contain both relevant and irrelevant
documents and all shades of partial relevance in between. Precision
measures how well the retrieved documents meet the needs of the
user; i.e., how many irrelevant documents were retrieved. Recall
measures how many of the relevant documents were actually retrieved.
To improve precision, retrieved documents are often ranked by
a presumed measure of relevance. To accurately measure precision
and recall requires omniscient knowledge of the all document contents
and the user's actual (not necessarily stated) needs. Needless
to say, actual systems can only estimate precision and recall.
The aim of any information retrieval system (web-based or otherwise)
is to maximize precision and recall at reasonable cost, while
minimizing complexity for the user.
These goals are of course mutually contradictory:
improving precision, even within a single system, generally
decreases recall, and vice versa;
exhaustive search yields higher recall, but at higher cost;
feedback mechanisms can improve precision and recall, but
at added complexity and cost;
timeline"
....
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