Table 4.

Confusion matrix for the classification of three human activities.

		True Labels
		A1	A2	A3	sum
Predicted labels	A1	TP 11	FP 12	FP 13	NI 1
	A2	FP 21	TP 22	FP 23	NI 2
	A3	FP 31	FP 32	TP 33	NI 3
	sum	NT 1	NT 2	NT 3	total