Table 2.

Features most correlated with the ground truth severity scores for the finger-tapping task.

Feature	Statistic	r	p-value	Rank
Speed	Inter-quartile range	−0.56	10−33	1
	Median	−0.52	10−27	2
	Maximum	−0.32	10−10	6
Amplitude	Median	−0.50	10−25	3
	Maximum	−0.41	10−17	4
Frequency	Inter-quartile range	0.32	10−10	5
	Standard deviation	0.29	10−8	8
Period	Entropy (i.e., irregularity)	0.32	10−10	7
	Variance (normalized by the average period)	0.28	10−8	9
	Inter-quartile range	0.27	10−7	10

The ground truth scores are obtained from the aggregate of expert ratings. r and p-value indicate Pearson’s correlation coefficient and significance level (obtained by correlation test), respectively. Features are ranked based on the correlation coefficients (the rank-1 feature is the most correlated with the ground truth severity scores).