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Table 1 The ten features with their units of measurement. The last column shows the notations we used for these feature

From: Towards affective touch interaction: predicting mobile user emotion from finger strokes

Feature Unit Notation
Deviation in number of strikes   F1
Deviation in number of taps   F2
Mode of strike length Millimeter F3
Average strike length Millimeter F4
Mode of strike speed Meter/second F5
Average strike speed Meter/second F6
Mode of delay Millisecond F7
Average delay Millisecond F8
Total delay Second F9
Turnaround time Second F10