I am in search for the average start-stop and speed values for common devices like mouse and use of fingertip.
Fitts's Law: MT = a + b log2(2A/W)
the values I am in search for are a and b in the formula. Exlanations of the Law can be find everywhere, but almost all state that a and b are device-dependent and can be determined experimentally. Instead of setting up a valid experiment straight away I would like to ask if somebody already has determined the values for common pointing devices.