nif:isString
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For two partitions P and P’, the Rand index is defined as ; where is the number of pairs of data objects belonging to the same class in P and to the same class in P’, is the number of pairs of data objects belonging to the same class in P and to different classes in P’, is the number of pairs of data objects belonging to different classes in P and to the same class in P’, and is number of pairs of data objects belonging to different classes in P and to different classes in P’.
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