West, Leonard J. - Santa Fe Institute - 1998
earlier research on the relative merits of the two keyboards provided unconfounded measures, ones permitting attributrion of … measures of speed on the two keyboards by the same persons. Eight experienced standard-keyboard typists, ranging in skill from …-81 words per minute), typed high-frequency digraphs on both keyboards, resulting in a 4.0% superiority for the Dvorak keyboard …