Eysenck's Personality Inventory (EPI) is a self-report questionnaire that measures personality traits such as extraversion, neuroticism, and psychoticism using a binary response format. Eysenck's Personality Questionnaire (EPQ) is an updated version of the EPI that includes additional scales and uses a Likert scale response format. The EPQ provides a more detailed assessment of personality compared to the EPI.

When applied to questionnaires, a short scale measurement refers to a questionnaire that is a condensed version of a longer questionnaire. The Eysenck Personality Questionnaire, for example ccnsists of 100 yes/no questions. The short scale version of the Eysenck Personality Questionnaire, however, has only 48 yes/no questions.

The Eysenck Personality Inventory. (1964),

by H. J. Eysenck, S. B. G. Eysenck

H.J. Eysenck was a psychologist known for his work in personality theory, intelligence, and behavior. He authored several influential books on topics such as temperaments, personality, and psychology, including "Dimensions of Personality" and "The Structure of Human Personality." Eysenck was also known for his research on the biological bases of personality and behavior.

Eysenck is to do with psychology not maths and he developed the ideas of personality types of extroversion introversion and neuroticism think again...