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Representing Features
- Similarity between tuples t 1 and t 2 w.r.t. categorical feature f
- Cosine similarity between vectors f ( t 1) and f ( t 2)
\[sim_f(t_{1},t_{2})=\frac{\sum_{k=1}^{L}f(t_{1}).P_{k}.f(t_{2}).P_{k}}{\sqrt{\sum_{k=1}^{L}f(t_{1}).P_{k}^{2}}.\sqrt{\sum_{k=1}^{L}f(t_{2}).P_{k}^{2}}}\]
- Most important information of a feature f is how f groups tuples into clusters
- f is represented by similarities between every pair of tuples indicated by f
- The horizontal axes are the tuple indices, and the vertical axis is the similarity
- This can be considered as a vector of N x N dimensions
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