Section 14 reviews the validity problem. The main difficulty is this: complex algorithms stand squarely between the data for which substructure is hypothesized and the solutions they generate; hence it is all but impossible to transfer a theoretical null hypothesis...
CITATION STYLE
Bezdek, J. C. (1981). Cluster Validity. In Pattern Recognition with Fuzzy Objective Function Algorithms (pp. 95–154). Springer US. https://doi.org/10.1007/978-1-4757-0450-1_4
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