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The way we interpret this hypothesis is that a term in the query used by a user is likely to be there because it is a good discriminator and hence we are interested in its close associates
...Discrimination power of an index term On p
...and in fact there made the comment that it was a measure of the power of term i to discriminate between relevant and non relevant documents
...Instead of Ki I suggest using the information radius,defined in Chapter 3 on p
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