Ecological validity is one of the forms of validity for an experiment. For an experiment to be ecologically valid, its results in the test should have some bearing on those outside, eg. testing human memory by asking people to remember strings of random letters is ecologically invalid, because people don't do that sort of thing normally. This article discusses validity in logic, for the term in the social sciences see validity (psychometric). ... From Latin ex- + -periri (akin to periculum attempt). ...
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Experimental validity
One of five forms of validity in psychology. Relates to the extent of which an experiment can be related to real-life situations.
A common approach, called criterion validity, is to correlate measures with a criterion measure known to be valid.
Content validity, or face validity, is simply a demonstration that the items of a test are drawn from the domain being measured; it does not guarantee that the test actually measures phenomena in that domain.
According to classical test theory, predictive or concurrent validity cannot exceed the square of the correlation between two versions of the same measure -- that is, validity cannot exceed reliability.
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