Psychometrics & Testing

Psychometric Test

A standardized, scientifically designed assessment that measures psychological attributes — personality traits, cognitive abilities, aptitudes, or attitudes — in a reliable and valid way.

Psychometric tests differ from casual quizzes in three key ways: standardization (same conditions for all test-takers), reliability (consistent results), and validity (measures what it claims to measure).

Types include: personality inventories (Big Five, MBTI), aptitude tests (IQ, reasoning), interest inventories (RIASEC), behavioral assessments (DISC), and emotional intelligence measures (EQ). Professional psychometric tests use 30-100+ items and are statistically validated on large samples.

In hiring, psychometric tests predict job performance better than interviews alone (Schmidt & Hunter, 1998). The Big Five predicts performance at r=0.20-0.30, while unstructured interviews predict at only r=0.10.

Related Terms

Test-Retest Reliability

A measure of how consistent a test's results are when the same person takes it again. High reliability (0.70+) means you'll get similar results each time.

Validity (Psychometric)

Whether a test measures what it claims to measure. A valid personality test actually predicts real-world outcomes like job performance, relationship satisfaction, or mental health.

Likert Scale

A response format used in personality tests where you rate agreement on a scale (e.g., "Strongly Disagree" to "Strongly Agree"). Named after psychologist Rensis Likert (1932).

Cronbach's Alpha

A statistic measuring internal consistency — how closely related a set of test items are as a group. Values above 0.70 indicate acceptable reliability for personality scales.

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