Similar concepts
Pages with this concept
| Similarity |
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| 47 |
that a search strategy will infallibly find the class of documents containing the relevant documents
...Note that the Cluster Hypothesis refers to given document descriptions
...As can be seen from the above,the Cluster Hypothesis is a convenient way of expressing the aim of such operations as document clustering
...The use of clustering in information retrieval There are a number of discussions in print now which cover the use of clustering in IR
...In choosing a cluster method for use in experimental IR,two,often conflicting,criteria have frequently been used
...1 the method produces a clustering which is unlikely to be altered drastically when further objects are incorporated,i
...2 the method is stable in the sense that small errors in the description of the objects lead to small changes in the clustering;3 the method is independent of the initial ordering of the objects
...These conditions have been adapted from Jardine and Sibson [2]... |
| 43 |
Classification methods Let me start with a description of the kind of data for which classification methods are appropriate
...1 multi state attributes e
...2 binary state e
...3 numerical e
...4 probability distributions
...The fourth category of descriptors is applicable when the objects are classes
...Some excellent surveys of classification methods now exist,to name but a few,Ball [21]has found it necessary to give a classification of classification
...Sparck Jones [24]has provided a very clear intuitive break down of classification methods in terms of some general characteristics of the resulting classificatory system
...1 Relation between properties and classes a monothetic b polythetic 2 Relation between objects and classes a exclusive b overlapping 3 Relation between classes and classes a ordered b unordered The first category has been explored thoroughly by numerical taxonomists
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| 47 |
that a search strategy will infallibly find the class of documents containing the relevant documents
...Note that the Cluster Hypothesis refers to given document descriptions
...As can be seen from the above,the Cluster Hypothesis is a convenient way of expressing the aim of such operations as document clustering
...The use of clustering in information retrieval There are a number of discussions in print now which cover the use of clustering in IR
...In choosing a cluster method for use in experimental IR,two,often conflicting,criteria have frequently been used
...1 the method produces a clustering which is unlikely to be altered drastically when further objects are incorporated,i
...2 the method is stable in the sense that small errors in the description of the objects lead to small changes in the clustering;3 the method is independent of the initial ordering of the objects
...These conditions have been adapted from Jardine and Sibson [2]... |
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