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Table 1 Extracted features

From: Making a good thing better: enhancing password/PIN-based user authentication with smartwatch

Feature Description
Mean Strength Arithmetic mean of the signal strength
Standard Deviation Standard deviation of the signal strength
Average Deviation Average deviation from mean
Skewness Measure of asymmetry about mean
Kurtosis Measure of the flatness or spikiness of a distribution
RMS Square root of arithmetic mean of squares of the signal strength