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Absolute Category Rating is a test method used in quality tests.
The levels of the scale are, sorted by quality in decreasing order:
In this method, a single test condition is presented to the viewers once only. They should then give a quality rating on an ACR scale. Test conditions should be presented in a random order per test person.
The ACR scale is evaluated based on numbers that are assigned to the individual items, where Excellent equals to 5 and Bad equals to 1. The average numeric score over all experiment participants, for each test condition that was shown, is called the mean opinion score.
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