Examlex
An externality is:
Standard Deviation
A measure of the amount of variation or dispersion of a set of values.
Reliability
Refers to the consistency and stability of a measure or test over time.
Validity
The extent to which a test, scale, or measuring instrument accurately measures what it is intended to measure.
Predictive Validity
The extent to which a score on a scale or test predicts future performance on a related measure.
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