Table 1.

The Confusion Matrix for ANN (20 Hz) with FFT-features (Unit: %).

Activity	Standing	Walking	Running	Upstairs	Downstairs	Hopping
Standing	40.5	12.6	7.5	12	13.4	11
Walking	9.6	44.4	13	9.5	12.5	12
Running	4.4	14.6	45	11.3	10.1	14.6
Upstairs	4	10.2	14	51	10.8	10
Downstairs	12.3	17.7	10	9.5	40.5	10
Hopping	7.5	10	9.3	9.5	12.7	51
Mean			45.41