Types of Test
A number of tests can be classified as discrimination tests. If it's designed to detect a difference then it's a discrimination test. The type of test determines the number of samples presented to each member of the panel and also the question(s) they are asked to respond to.
Schematically, these tests may be described as follows; A & B are used for knowns, X and Y are used for different unknowns, while (AB) means that the order of presentation is unknown:
- Paired comparison
- XY or (AB) – two unknown samples, known to be different, test is which satisfies some criterion (X or Y); unlike the others this is not an equality test.
- Duo-trio
- AXY – one known, two unknown, test is which unknown is the known (X = A or Y = A)
- Triangle
- (XXY) – three unknowns, test is which is odd one out (Y = 1, Y = 2, or Y = 3).
- ABX
- ABX – two knowns, one unknown, test is which of the knowns the unknown is (X = A or X = B).
- Duo-trio in constant reference mode
- (AB)X – three unknowns, where it is stated that the first two are different, but which is which is not identified, test is which of the first two the third is (X = 1 or X = 2).
Read more about this topic: Discrimination Testing
Famous quotes containing the words types of, types and/or test:
“Science is intimately integrated with the whole social structure and cultural tradition. They mutually support one other—only in certain types of society can science flourish, and conversely without a continuous and healthy development and application of science such a society cannot function properly.”
—Talcott Parsons (1902–1979)
“If there is nothing new on the earth, still the traveler always has a resource in the skies. They are constantly turning a new page to view. The wind sets the types on this blue ground, and the inquiring may always read a new truth there.”
—Henry David Thoreau (1817–1862)
“The test of a vocation is the love of the drudgery it involves.”
—Logan Pearsall Smith (1865–1946)