Thurstonian Models for the Duo‐Trio and Its Variants

ABSTRACT The duo‐trio is one of the basic sensory discrimination methods. There are various variants of the duo‐trio including the double duo‐trio (DDT), the dual reference duo‐trio (DRDT), the paired duo‐trio with AB and BA pairs (PDT AB ), and the paired duo‐trio with same (AA or BB) and different (AB or BA) pairs (PDT SD ). Thurstonian models, that is, psychometric functions for the duo‐trio and its four variants, DDT, DRDT, PDT AB , and PDT SD , are reviewed and developed in this paper. The theorized performances, that is, statistical powers of the four variants were explored and compared with the conventional duo‐trio. R codes are developed and provided for analyses of the data of the duo‐trio and its variants.