Personality Testing Glossary

A statistical metric estimating the internal consistency and reliability of a psychometric scale.

Cronbach's alpha measures how closely related a set of items are as a group. Values above 0.70 generally indicate acceptable internal consistency, while values exceeding 0.85 indicate high reliability suitable for individual clinical assessment.

The degree to which a test measures the specific theoretical construct it intends to evaluate.

Construct validity requires demonstrating both convergent validity (correlating with other established instruments assessing the same trait) and discriminant validity (not correlating excessively with unrelated traits).

The predominant empirical model of personality taxonomy based on five broad continuous domains.

Comprising Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism (OCEAN). Each factor subsumes six underlying sub-facets evaluated on a continuous normative spectrum rather than rigid types.

A paradigm for the design, analysis, and scoring of tests based on individual item difficulty and discrimination parameters.

Unlike Classical Test Theory (CTT), IRT models the probability of a test-taker selecting a specific response based on their latent trait level (theta), allowing for computerized adaptive testing (CAT).

Mental processes identified by Carl Jung describing orientations of perception (S/N) and judgment (T/F).

The eight cognitive functions (Extraverted/Introverted Thinking, Feeling, Sensing, and Intuition) dictate cognitive preference hierarchies in Jungian typology and form the theoretical backbone of MBTI archetypes.

A measure of consistency obtained by administering the same test twice over a given period to a group of individuals.

Assesses temporal stability. True personality traits exhibit high test-retest coefficients (r > 0.80) across months or years, distinguishing stable traits from temporary emotional states.

The psychological phenomenon where individuals give high accuracy ratings to vague, universally applicable descriptions.

A critical bias in non-scientific personality assessments. Standardized psychometric evaluations avoid the Barnum effect by delivering normative percentile comparisons rather than generic qualitative summaries.

Normative tests compare individuals against population averages; ipsative tests compare traits within an individual.

Normative scoring utilizes Likert scales evaluated against a population bell curve. Ipsative scoring forces choices between desirable options, which eliminates response bias but prevents valid between-person comparison.

A quadrant-based behavioral model evaluating Dominance, Influence, Steadiness, and Conscientiousness.

Developed by William Moulton Marston, DISC measures observable behavioral tendencies and communication styles in organizational environments rather than deep latent emotional personality traits.

Statistical method used to identify underlying clusters of correlations among test items.

Exploratory Factor Analysis (EFA) discovers latent constructs within raw item datasets, while Confirmatory Factor Analysis (CFA) tests whether item data fits a theoretical factor model (such as the Big Five).

The fundamental domain measuring emotional stability, stress reactivity, and negative affectivity.

Includes six sub-facets: Anxiety, Angry Hostility, Depression, Self-Consciousness, Impulsiveness, and Vulnerability. High scores correlate with heightened amygdala reactivity.

The tendency of test-takers to answer questions in a manner that will be viewed favorably by others.

Mitigated in standardized tests through validity scales (e.g., Lie scales), forced-choice ipsative item structures, or statistical adjustments based on impression management scales.