The study of psychological measurement, including questionnaire construction, measurement reliability and construct validity. A score can be repeatable without supporting the intended interpretation; consistency and validity answer different questions.
Psychometrics is a field of study concerned with the theory and technique of psychological measurement. This includes the assessment of knowledge, abilities, attitudes, personality traits, and other psychological constructs. The goals of psychometrics include developing reliable and valid instruments for measuring these constructs, analyzing the data obtained from these instruments, and interpreting the results.
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