Interactions of reliabilities in personality measurement

A novel statistical technique was used to look at the interactions of the reliabilities of personality measures with each other and with the personality scores themselves. The personality test used was Eysencks’ PQ questionnaire which gives measures of psychoticism (P), extraversion (E), neuroticism (N) and a lie scale (L). Lower reliability in the P scale for high P scorers was found. The reliabilities of the P, E, N and L scales were found to be correlated. A relationship was found between E and a common reliability factor.