3.3 Nominal Variables
The following measures can be used for nominal variables, if cases are clustered:
• Simple matching coefficient
• Coefficient kappa for nominal variables (Fleiss 1981: 218-220; Bacher 1996: 212)
• City block metric
• Squared Euclidean distances
For clustering variables, Cramer’s V and other association coefficients can be used, too.
3.4 Ordinal Variables
Measures for ordinal variables are:
• Correlation coefficients, like Kendal’s tau or Gamma
• City block metric (has an ordinal interpretation)
• Coefficient kappa for ordinal variables
Special measures are:
Canberra Metric (dissimilarity coefficient):