[Retracted] K-Means Algorithm to Identify the Elderly Psychological Stress Analysis Algorithm

Table 1

Frequency and noise distribution of wavelet decomposition.

Low-frequency components	Frequency range	Noise	High-frequency components	Frequency range	Noise
A0	0–125	—	D0	105–240
A1	0–62.5	—	D1	60.5–10.5	EMG interference
A2	0–31.3	—	D2	30.3–52.5	Power frequency interference
—	—	—	—	—	EMG interference
A3	0–15.6	—	D3	14.6–30.3	EMG interference
A4	0–7.8	—	D4	6.8–15.6	EMG interference
A5	0–3.9	—	D5	2.8–7.8	EMG interference
A6	0–1.9	—	D6	1.8–3.9
A7	0–0.9	Baseline drift	D7	0.8–1.9