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Describe the potential dangers of using St. John's wort.
Face Validity
The degree to which an assessment instrument, such as a questionnaire, on its face appears to measure what it is intended to measure. For example, a face-valid measure of sociability might ask about attendance at parties.
Exploratory Factor Analysis
A statistical technique used to identify potentially underlying variable structures within a set of observed variables without a preconceived structure in mind.
Confirmatory Factor Analysis
A statistical method used to test whether a set of observed variables represents a number of underlying factors.
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