Table 5.

The number of selected features according to different activity datasets and scenarios.

Activity	Only Gyro 1	Only Acc 2	Acc 2 and Gyro 1	Balanced Data	Unbalanced Data	Selected Features
Walk	19	25	54	43	39	42
Jog	17	36	61	40	44	59
Skip	12	34	53	36	51	51
Stay	25	8	7	8	5	7
Stairs Up	12	31	32	36	40	34
Stairs Down	18	32	48	38	24	46

¹ Gyroscope, ² Accelerometer