[net.mail.headers] Question on Probability of Keyboard Error

dca-pgs@DDN1.ARPA (02/05/85)

Is there a widely accepted human-factors number on
probability of typing error with either/both of
the density variables being (1)time, (2)characters to be
typed?

Are there any good references on the subject?

Thank you,
Pat Sullivan
DCEC
Reston, VA