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The Psychometrics is the science students of all measurement techniques practiced in psychology and the technical validation of these measures. These techniques apply to all fields of psychology and other fields related sciences (such as research in consumer behavior, for example) but they were mainly developed originally for the measurement of intellectual performance ( ages mental or intelligence quotient , quotient development in early childhood, etc.). or for the analysis of the components of personality (affectivity, emotions, relationships with others, etc.). It is the science of measurement of the mind, which becomes a science by introducing arithmetic and calculation in the phenomena of mind because its founder was a mathematician.

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