Ranking

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Ranking

Definition

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A ranking is a relationship between a set of items such that, for any two items, the first is either 'ranked higher than', 'ranked lower than' or 'ranked equal to' the second. In mathematics, this is known as a weak order or total preorder of objects. It is not necessarily a total order of objects because two different objects can have the same ranking. The rankings themselves are totally ordered. For example, materials are totally preordered by hardness, while degrees of hardness are totally ordered. By reducing detailed measures to a sequence of ordinal numbers, rankings make it possible to evaluate complex information according to certain criteria. Thus, for example, an Internet search engine may rank the pages it finds according to an estimation of their relevance, making it possible for the user quickly to select the pages they are likely to want to see. Analysis of data obtained by ranking commonly requires non-parametric statistics.

English Wikipedia http://en.wikipedia.org/wiki/Ranking

Spanish wikipedia http://es.wikipedia.org/wiki/Ranking

Wiki page external link http://papers.ssrn.com/abstract=806144 http://papers.ssrn.com/abstract=897063 http://research.microsoft.com/en-us/projects/trueskill/default.aspx http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=19496