Floor EFFECT
The floor effect refers to a phenomenon in which the lowest possible score on a test or measurement instrument "floors" the scores of some individuals, making it difficult or impossible to distinguish between those who scored at the lowest level and those who may have scored even lower.
For example, a test with a lowest possible score of 0 have a floor effect for individuals who scored 0, making it impossible to determine if they truly have no knowledge or skill in the subject being tested, or if they are simply unable to perform any better on the test.
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