The design is a balanced incomplete block design with rows as blocks. If one assumes that there is a preperiod, i.e. that each assessor is given the treatment of the fifth period before the experiment starts, then the design is carryover balanced.
A matrix with 12 rows corresponding to the assessors, 5 columns corresponding to the five periods.
The five treatments (products) to be tested are numbered 1,...,5.
Kunert, J. (1998): Sensory experiments as crossover studies. Food Quality and Preference 9, 243-253 (design d4).
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