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Buy Wholesale and maintain an Active status for 2 months and we will refund your $39 Distributor Fee
30-AUGUST-2008 03:13:07 - Discrimination testing Discrimination testing is a technique employed in sensory analysis to determine whether there is a detectable difference among two or more products. The test uses a trained panel to discriminate from one product to another. Contents 1 Statistical basis 1.1 Paired comparison 1.1.1 Advantages 1.1.2 Disadvantages 1.2 Duo-trio 1.2.1 Advantages 1.2.2 Disadvantages 1.3 Triangle 1.3.1 Advantages 1.3.2 Disadvantages 1.4 Degree of difference DoD 2 Signal Detection Theory 3 Experimental design Statistical basis The statistical principle behind any discrimination test should be to reject a null hypothesis H0 that states there is no detectable difference between two or more products. If there is sufficient evidence to reject H0 in favour of the alternative hypothesis, HA:There is a detectable difference, then a difference can be recorded. However, failure to reject Ho should not be assumed to be sufficient evidence to accept it. H0 is formulated on the premise that all of the assessors guessed when they made their response. The statistical test chosen should give a probability value that the result was arrived at through pure guesswork. If this probability is sufficiently low usually below 0.05 or 5% then H0 can be rejected in favour of HA. Tests used to decide whether or not to reject H0 include binomial, χ2 Chi-squared, others? Help needed -== 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 questions they are asked to respond to. Paired comparison In this type of test the assessors are presented with two products and are asked to state which product fulfils a certain condition. This condition will usually be some attribute such as sweetness, sourness, intensity of flavour, etc. The probability for each assessor arriving at a correct response by guessing is p = 0.5 Advantages One of the quickest and easiest of tests to execute. Can be used to determine whether formulation changes are detectable. Disadvantages Need to know in advance the attribute that is likely to change. Not statistically powerful with large panel sizes required to obtain sufficient confidence. Duo-trio The assessors are presented with three products, one of which is identified as the control. Of the other two, one is identical to the control, the other is the test product. The assessors are asked to state which product more closely resembles the control. The probability for each assessor arriving at a correct response by guessing is p = 0.5 Advantages Quick to set up and execute. No need to have prior knowledge of nature of difference. Disadvantages Not statistically powerful therefore relatively large panel sizes required to obtain sufficient confidence. Triangle The assessors are presented with three products, two of which are identical and the other one different. The assessors are asked to state which product they believe is the odd one out. The probability for each assessor arriving at a correct response by guessing is p = 1 / 3 Advantages Can be quick to execute and offers greater power than paired comparison or duo-trio. Disadvantages Degree of difference DoD Signal Detection Theory Experimental design Food portal v d e Food science Allergy · Chemistry · Engineering · Law · Microbiology · Packaging · Processing · Quality · Foodservice catering · Technology · Nutrition · Product development · Sensory analysis discrimination testing · Superfood Retrieved from http://en..org/wiki/Discrimination_testing Categories: Nonverbal communication Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Français This page was last modified on 29 July 2008, at 08:52
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So many of us do not eat a balanced diet, get enough sleep, have too much stress, or are impacted with toxins and pollutants. Drinking 2 ounces of MonaVie twice a day will help your body detoxify as well as build your immune system. Its the smartest thing you can do for yourself, so start today. Buying MonaVie through our company guarantees you support 7 days a week and, if you would like to share MonaVie with your family and friends we will guide you from start to finish.
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