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Similarity and Dissimilarity

  • Similarity
    • Numerical measure of how alike two data objects are
    • Value is higher when objects are more alike
    • Often falls in the range [0,1]
  • Dissimilarity (e.g., distance)
    • Numerical measure of how different two data objects are
    • Lower when objects are more alike
    • Minimum dissimilarity is often 0
    • Upper limit varies
  • Proximity refers to a similarity or dissimilarity

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