Discriminative Test

Question 1

What can Discriminative Test can be use for?

Answer 1

Discrimination test can be used to address a variety of practical objectives. In some cases researchers are interested in demonstrating that two samples are perceptibly different. In other cases, researchers want to determine if two samples are sufficiently similar to used interchangeably.
In yet another set of cases some researchers want to demonstrate a difference while other researchers involved in the same study want to demonstrate similarity.

Question 2

What is Difference Test?

Answer 2

sensory difference tests are comparative procedures for use in the study of sensory discriminability of similar types of stimuli.

Question 3

What is - Overall of Difference Test? - (3)

Answer 3

Does a sensory difference exist between samples?

Those tests are designed to show whether subjects can detect any difference at all between samples

Sensory dimension is unknown (meaning it is unclear how the products may differ)

Question 4

How to apply - Overall difference Test? -

Answer 4

To determine whether any product differences result from a change in ingredients, processing, packaging or storage

To determine whether an overall difference exists, where no specific attributes can be identified as having been affected

To determine whether two samples are sufficiently similar to be used interchangeably

To select and train panelists and to monitor their ability to discriminate between samples

Question 5

7 type of - Overall Difference Test -

Answer 5

Triangle test
Duo-trio test
Two out of five test
Same/different test
A-not-A test
Degree of difference test (difference from control test)
Sequential test
Similarity mode

Question 6

What is - Attribute Difference Test? - (3)

Answer 6

How does attribute X differ between samples

Subjects are asked to concentrate on a single attribute (or a few attributes). All other attributes are ignored.

Sensory dimension expected, suggested, known

Question 7

How to apply - Attribute Difference Test -

Answer 7

To determine whether or not, or the degree to which two or more samples differ with respect to one defined attribute.

It may be a single attribute such as sweetness, a combination of several related attributes, such as freshness, or an overall evaluation, such as preference.

Question 8

6 Types of - Attribute Difference Test -

Answer 8

2 AFC test (paired comparison test)
Pairwise ranking test
Simple ranking test
Rating of several samples
Balanced incomplete block
Rating of several samples, Balanced incomplete block

Question 9

3 Stimuli - Discriminative Test - (2)

Answer 9

Duo - Trio

Triangle

Question 10

2 Stimuli - Discriminative Test - (3)

Answer 10

Paired comparison test

2 AFC test

Unspecified (simple difference test, same/different test)

Question 11

Moren than 3 - Discriminative Test - (3)

Answer 11

n-AFC

Two out of five test

Ten out of hundred

Question 12

Basic Characteristics of Difference Test

Answer 12

Forced choice
Chance probability of being rightis high
Need statistics and distributions to indicate chance of finding the result (statistical table: tables of correct judgment and p-values: 17.7-17.14; Xsquare: table 17.5; Normal distribution and Z-test: table 17.2