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Proximity Measure for Nominal Attributes

  • Can take 2 or more states, e.g., red, yellow, blue, green (generalization of a binary attribute)
  • Method 1: Simple matching
    • m : # of matches, p : total # of variables

\[ d(i,j)=\frac{p-m}{p} \]

  • Method 2: Use a large number of binary attributes
    • creating a new binary attribute for each of the M nominal states

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