/usr/share/psychtoolbox-3/Psychometric/FindThreshWeibTAFC.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | function threshold = FindThreshWeibTAFC(pCorrect,alpha,beta)
% threshold = FindThreshWeibTAFC(pCorrect,alpha,beta)
%
% Invert Weibull function to find threshold for given pcorrect,
% alpha, and beta.
%
% This function should invert ComputeWeibTAFC().
%
% 8/25/94 dhb, ccc New name, fixed comments
if (pCorrect <= 0.0 | pCorrect > 1.0)
error('pCorrect is out of bounds');
end
threshold = alpha .* ( -1.0*log(2.0 .* (1.0-pCorrect))) .^(1.0./beta);
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