Detection and Quantification of Resting Tremor in Parkinson’s Disease Using Long-Term Acceleration Data

Table 3

The selected five features.

Feature	Symbol	Physical meanings
Mean amplitude	mAmp	Average amplitude of acceleration signal.
Sample entropy	SampEn	Complexity of acceleration signal, quantifying the regularity of acceleration signal.
Dominant frequency	DF	The frequency with highest amplitude in PSD.
Energy	E	The energy of acceleration signal in 5 seconds.
Spectrum concentration	SE	The characteristic of spectrum distribution, describing how frequency component concentrated around dominant frequency.