psychometrics
Academic field concerned with the theory and technique of psychological measurement, including the development of tests and questionnaires.
Psychometrics is an indispensable field for developing intelligence tests and personality tests.
心理統計学 focuses on statistical methods in psychology, while 心理測定学 specifically deals with the measurement of psychological constructs.
Compound of 心理 (psychology) + 測定 (measurement) + 学 (study). A modern academic term, likely a calque from English 'psychometrics'.