Calculate d' for a 3 stimulus (triangular) paradigm. Two of the stimuli are the same and the observer must designate the stimulus that is different.
numeric in (1/3, 1). The proportion of correct responses for an unbiased observer.
Returns the value of d'
Frijters, G. S., Kooistra, A. and Verijken, P. F. G. (1980) Tables of d' for the triangular method and the 3-AFC signal detection procedure. Perception & Psychophysics, 27, 176–178.
MacMillan, N. A. and Creeman, C. D. (1991) Detection Theory: A User's Guide Cambridge University Press
Green, D. M. and Swets, J. A. (1966) Signal Detection Theory and Psychophysics Robert E. Krieger Publishing Company
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