Both reliability and validity are measured by

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Both reliability and validity are measured by correlation coefficients. Reliability refers to the consistency of measurement, and is typically measured using test-retest reliability (correlating scores from the same test taken at different times) or internal consistency reliability (correlating scores from different items on the same test). Validity refers to the accuracy of measurement, and is typically measured using criterion-related validity (correlating a test score with an external criteria, such as job performance) or construct validity (correlating a test score with other measures of the same construct). Correlation coefficients are used to quantify the strength and direction of these relationships.

Both Reliability and Validity Are Measured by