Can you tell the difference? A quick look into discrimination testing.

Brandon Rozek provides a quick introduction to discrimination testing used in the food industry. One that caught my attention was tetrad testing:

Tetrad testing is when the participant is given 4 samples and are asked to pair up the equivalent ones. The probability of guessing correctly is equivalent to that of the triangle test [one out of three], but Ennis and Jesionka show that in some cases the Tetrad test requires one third the number of participants as that required by the triangle test. The Institute for Perception released a techincal report arguing for the switch to Tetrad testing in order to reduce costs. There’s even a fun presentation publicly available by Hannah Lemar showing the suitability of the Tetrad test in the brewing industry.