| Automatic
Approaches |
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| • | Discover the
categories (bins) |
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| – | Use clustering
techniques |
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| • | Name the
categories (bins) |
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| – | Use statistical
techniques (e.g., centroid) |
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| • | Classify data
into the categories (bins) |
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| – | Unsupervised:
similarity measures in vector |
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| space |
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| – | Supervised: use a
training set |
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| • | Compare to
manual as gold standard |
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