10. The at least one computer-readable storage medium of claim 9 , wherein: the typing speed of input received via the soft keyboard is based on a measured average time between user activations of the keyboard.
11. The at least one computer-readable storage medium of claim 10 , wherein: the instructions for computing the first and second probability distribution function comprise instructions that increase the indication of the spread of the first probability distribution function in response to an increase in the typing speed of the input received via the soft keyboard.