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Table 4 Performance metrics

From: Comparison between sEMG and force as control interfaces to support planar arm movements in adults with Duchenne: a feasibility study

Performance Metric Description
Percentage of Task Completion (%): Ratio between the maximum active distance and the maximum passive distance for each of the five directions expressed as a percentage.
Tracing Error (cm): Mean distance between each position of the endpoint’s trajectory and the target line.
Smoothness (-): Spectral arc length (SPARC). The length of the frequency spectrum of the speed profile of a movement. [35].
Speed (cm/s): The mean speed of a movement.