Which psychometric property refers to the consistency of test scores across time?

Which psychometric property refers to the consistency of test scores across time?

• A. Validity across populations
• B. Brevity
• C. Norms represent population
• D. Stability of scores across time

Answer: (D)

The idea being tested is reliability over time. When a test yields similar results for the same person on different occasions, we say it has temporal stability, often called test-retest reliability. To assess this, you administer the same test twice after a suitable interval and look at the correlation between the two sets of scores. A high correlation indicates that scores are stable over time and not heavily influenced by random error or short-term changes in the person. This focus on consistency across time distinguishes it from other psychometric properties. Validity across populations concerns whether the test measures the intended construct across different groups. Norms represent the representativeness of the standardization sample. Brevity relates to how short the test is, not how stable scores are over time.

The idea being tested is reliability over time. When a test yields similar results for the same person on different occasions, we say it has temporal stability, often called test-retest reliability. To assess this, you administer the same test twice after a suitable interval and look at the correlation between the two sets of scores. A high correlation indicates that scores are stable over time and not heavily influenced by random error or short-term changes in the person.

This focus on consistency across time distinguishes it from other psychometric properties. Validity across populations concerns whether the test measures the intended construct across different groups. Norms represent the representativeness of the standardization sample. Brevity relates to how short the test is, not how stable scores are over time.