The Eysenck Personality Questionnaire (EPQ) was administered to 675 undergraduate psychology students, and data were examined with regard to central tendency and variability, scale intercorrelations, the internal consistencies of the scales, and the factor structure of the instrument by using two analytical approaches. Scale means and standard deviations were comparable to those found with other samples, and the scales were generally orthogonal to one another. Although the Extraversion, Neuroticism, and Lie scales appeared internally consistent, the Psychoticism scales demonstrated relatively low reliability. A serious problem appears to exist in the factor structure of the EPQ and thus with a meaningful interpretation of its factorial validity. The Psychoticism scale, in particular, needs to be reassessed as to both its item composition and the underlying construct it purports to measure.

1. Eysenck Personality Questionnaire Manual

Clinical implications of the findings are presented. The P scale and psychosis. Journal of Abnormal Psychology, 1977, 86, 127- 134., Block, J.

Eysenck Personality Questionnaire Manual

P scale and psychosis: Continued concerns. Journal of Abnormal Psychology, 1977, 86, 431- 434., Eysenck, H. And Eysenck, S. Manual of the Eysenck Personality Inventory. San Diego: Educational and Industrial Testing Service, 1964.

And Eysenck, S. A factorial study of psychoticism as a dimension of personality. Multivariate Behaviour Research, All-Clinical Special Issue, 1968, 15- 31. (a) Eysenck, S. And Eysenck, H. The measuremeant of psychoticism: A study of factor stability and reliability.

British Journal of Social and Clinical Psychology, 1968, 7, 286- 294. (b), Eysenck, H. And Eysenck, S. Personality structure and measurement. San Diego: Knapp, 1969. And Eysenck, S. The orthogonality of psychoticism and neuroticism: A factorial study.

Perceptual and Motor;Skills, 1971, 33, 461- 462., Eysenck, S. And Eysenck, H.

The questionnaire measurement of psychoticism. Psychological Medicine, 1972, 2, 50- 55., Eysenck, H. And Eysenck, S. Manual of the Eysenck Personality Questionnaire.

San Diego: Educational and Industrial Testing Service, 1975. And Eysenck, S. Psychoticism as a dimension of personality. London: Hodder and Stoughton, 1976. And Eysenck, S. Block and psychoticism.

Journal of Abnormal Psychology, 1977, 86, 651- 652., Farley, F. PENmanship: Faking the P-E-N. British Journal of Social and Clinical Psychology, 1976, 15, 139- 148., Guttman, L. Some necessary conditions for common factor analysis.

Psychometrika, 1954, 19, 149- 161., Hendrickson, A. And White, P. Promax: A quick method for rotation to oblique simple structure. British Journal of Statistical Psychology, 1964, 17, 65- 70., Howarth, E. A psychometric investigation of Eysenck's personality inventory.

Journal of Personality Assessment, 1976, 40, 173- 185., Jennrick, R. And Sampson, P. Rotation for simple loadings.

Psychometrika, 1966, 31, 313- 323., Kaiser, H. A second generation Little Jiffy. Psychometrika, 1970, 35, 401- 415., Loo, R. A psychometric investigation of the Eysenck Personality Questionnaire. Journal of Personality Assessment, 1979, 43, 54- 58.,.

The Eysenck Personality Questionnaire (EPQ) was administered to 675 undergraduate psychology students, and data were examined with regard to central tendency and variability, scale intercorrelations, the internal consistencies of the scales, and the factor structure of the instrument by using two analytical approaches. Scale means and standard deviations were comparable to those found with other samples, and the scales were generally orthogonal to one another. Although the Extraversion, Neuroticism, and Lie scales appeared internally consistent, the Psychoticism scales demonstrated relatively low reliability. A serious problem appears to exist in the factor structure of the EPQ and thus with a meaningful interpretation of its factorial validity.

The Psychoticism scale, in particular, needs to be reassessed as to both its item composition and the underlying construct it purports to measure. Clinical implications of the findings are presented. The P scale and psychosis. Journal of Abnormal Psychology, 1977, 86, 127- 134., Block, J. P scale and psychosis: Continued concerns. Journal of Abnormal Psychology, 1977, 86, 431- 434., Eysenck, H. And Eysenck, S.

Manual of the Eysenck Personality Inventory. San Diego: Educational and Industrial Testing Service, 1964. And Eysenck, S. A factorial study of psychoticism as a dimension of personality. Multivariate Behaviour Research, All-Clinical Special Issue, 1968, 15- 31.

(a) Eysenck, S. And Eysenck, H. The measuremeant of psychoticism: A study of factor stability and reliability. British Journal of Social and Clinical Psychology, 1968, 7, 286- 294. (b), Eysenck, H. And Eysenck, S.

Personality structure and measurement. San Diego: Knapp, 1969. And Eysenck, S. The orthogonality of psychoticism and neuroticism: A factorial study. Perceptual and Motor;Skills, 1971, 33, 461- 462., Eysenck, S. And Eysenck, H.

The questionnaire measurement of psychoticism. Psychological Medicine, 1972, 2, 50- 55., Eysenck, H. And Eysenck, S.

Manual of the Eysenck Personality Questionnaire. San Diego: Educational and Industrial Testing Service, 1975. Suzuki ignis 2001 service manual. And Eysenck, S. Psychoticism as a dimension of personality. London: Hodder and Stoughton, 1976. And Eysenck, S. Block and psychoticism.

Journal of Abnormal Psychology, 1977, 86, 651- 652., Farley, F. PENmanship: Faking the P-E-N. British Journal of Social and Clinical Psychology, 1976, 15, 139- 148., Guttman, L. Some necessary conditions for common factor analysis.

Psychometrika, 1954, 19, 149- 161., Hendrickson, A. And White, P.

Promax: A quick method for rotation to oblique simple structure. British Journal of Statistical Psychology, 1964, 17, 65- 70., Howarth, E. A psychometric investigation of Eysenck's personality inventory.

Journal of Personality Assessment, 1976, 40, 173- 185., Jennrick, R. And Sampson, P. Rotation for simple loadings. Psychometrika, 1966, 31, 313- 323., Kaiser, H.

A second generation Little Jiffy. Psychometrika, 1970, 35, 401- 415., Loo, R.

A psychometric investigation of the Eysenck Personality Questionnaire. Journal of Personality Assessment, 1979, 43, 54- 58.,.

Eysenck Personality Questionnaire (EPQ) Eysenck, H. J., & Eysenck, S. Manual of the Eysenck Personality Questionnaire (Junior and Adult). Kent, UK: Hodder & Stoughton Table of Contents History of Use Description: Purpose The EPQ was designed to assess the personality traits of psychoticism, extraversion, neuroticism, and social desirability. Questions assessing impulsivity are in the psychoticism sub-scale and questions assessing sensation-seeking and venturesomeness are in the extraversion sub-scale. These latter constructs are presumed to contribute to risk preferences. Questions 100 items using a yes/no format.

Sub-scales. Psychoticism. Extraversion. Neuroticism. Social Desirability Domain Psychometrics Sample items Scale not publicly available. References: Scale: Eysenck, H.

J., & Eysenck, S. Manual of the Eysenck Personality Questionnaire (Junior and Adult).

Kent, UK: Hodder & Stoughton Selected Uses:. Corulla, W. A further psychometric investigation of the Sensation Seeking Form-V and its relationship to the EPQ-R and the 1.7 Impulsiveness Questionnaire. Personality and Individual Differences, 9(2), 277-287. Daderman, A.

Differences between severely conduct-disordered juvenile males and normal juvenile males: the study of personality traits. Personality and Individual Differences, 26(5), 827-845. Engstrom, G., Alsen, M., Gustavsson, P., Schalling, D., & Traskman-Bendz, L. Classification of suicide attempters by cluster analysis: A study of the temperamental heterogeneity in suicidal patients. Personality and Individual Differences, 21(5), 687-695.

Goma-i-Freixanet, M. Prosocial and antisocial aspects of personality. Personality and Individual Differences, 19(2), 125-134. Rawlings, D. The correlation of the EPQ psychoticism with two behavioral measures of impulsivity.

Personality and Individual Differences, 5(5), 591-594. Renner, W., & Anderle, F. Venturesomeness and extraversion as correlates of juvenile drivers' traffic violations.

Accident Analysis and Prevention, 32(5), 673-678. Roger, D., & Morris, J. The internal structure of the EPQ scales. Personality and Individual Differences, 12(7), 759-764.