Psychometrics

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For the parapsychology phenomenon of distance knowledge, see psychometry.

For the measurement of the heat and water vapor properties of air, see psychrometrics.

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Psychometrics is the field of study concerned with the theory and technique of educational and psychological measurement, which includes the measurement of knowledge, abilities, attitudes, and personality traits. The field is primarily concerned with the study of differences between individuals and between groups of individuals. It involves two major research tasks, namely: (i) the construction of instruments and procedures for measurement; and (ii) the development and refinement of theoretical approaches to measurement.