Table 1.

Estimated list of classification.

	Same clustering	Different clustering
The same classification	TP means the number of data in the same classification divided into the same cluster (a)	FN refers to number of data in the same classification divided into different clusters (c)
The different classification	FP refers to the number of data in different classifications divided into the same cluster (d)	TN refers to the number of data in different classifications divided into different clusters (d)