Inverse Rationalized Arcsine Transform

% IRAU rationalized arcsine transform
% IRAU(RAU,N) transforms the RAU values to the number of correct responses
% using the rationalized arcsine transform. N gives the number of repetitions.
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% IRAU(RAU,N,opt) defines one of the following options:
% 'Pc' ... IRAU returns the percent correct scores (0..100%)
% 'X' ... IRAU returns the number of correct responses (0..N, default)
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% The formula are based on Sherbecoe and Studebaker,
% Int. J. of Audiology 2004; 43; 442-448
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% See also RAU.