Concepts
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the system to its user will be the best that is obtainable on the basis of those data
...Of course this principle raises many questions as to the acceptability of the assumptions
...The probability ranking principle assumes that we can calculate P relevance document,not only that,it assumes that we can do it accurately
...So returning now to the immediate problem which is to calculate,or estimate,P relevance document
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language input and storage more feasible
...The reader will have noticed that already,the idea of relevance has slipped into the discussion
...Intellectually it is possible for a human to establish the relevance of a document to a query
...An information retrieval system Let me illustrate by means of a black box what a typical IR system would look like
...Starting with the input side of things
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| 112 |
of presenting the basic theory;I have chosen to present it in such a way that connections with other fields such as pattern recognition are easily made
...The fundamental mathematical tool for this chapter is Bayes Theorem:most of the equations derive directly from it
...This was recognised by Maron in his The Logic Behind a Probabilistic Interpretation as early as 1964 [4]...Remember that the basic instrument we have for trying to separate the relevant from the non relevant documents is a matching function,whether it be that we are in a clustered environment or an unstructured one
...It will be assumed in the sequel that the documents are described by binary state attributes,that is,absence or presence of index terms
...Estimation or calculation of relevance When we search a document collection,we attempt to retrieve relevant documents without retrieving non relevant ones
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