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Dichotic listening test in case of small stimulus set: Random walk and sequential wald analysis

Procedures of dichotic listening of speech are considered. Random walk theory and sequential Wald analysis are proposed as a means to minimize the necessary number of stimuli presentations, keeping statistical significance of the results at an acceptable level. An algorithm of choosing of the earliest possible stopping time of experiment, when providing conclusive results is proposed. The algorithm can be propagated to all cases of binary variable, observed at medium or small sets. A number of formulae useful for prediction of the laterality index, including ones implying absolute exactness of results, are presented.