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Attributes of Mixed Type
- A database may contain all attribute types
- Nominal, symmetric binary, asymmetric binary, numeric, ordinal
- One may use a weighted formula to combine their effects
\[ d(i,j) = \frac{\sum_{f=1}^{p} \delta _{ij}^{(f)} d_{ij}^{(f)}}{\sum_{f=1}^{p} \delta _{ij}^{(f)}} \]
- f is binary or nominal:
- dij(f) = 0 if xif = xjf , or dij(f) = 1 otherwise
- f is numeric: use the normalized distance
- f is ordinal
- Compute ranks rif and
- Treat zif as interval-scaled
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