Construct Validity - EPQR & Klines PPQ

The Relationship between the 15FQ™ and EPQR & I7

A sample of 221 volunteers completed both the 15FQ™ and the EPQR and I7 as part of a test validation exercise... 

As can be observed from the table above, both EPQR Extraversion and Neuroticism are well measured by 15FQ™ dimensions. Extraversion correlates substantially with 15FQ™ Outgoing, Enthusiasm, Social Boldness and inversely with Self-sufficiency. Neuroticism on the EPQR is related to all three principal 15FQ™ anxiety measures: Calm-stable, Self-doubting and Tense-driven. Psychoticism is not well measured by 15FQ™ as would be expected. There are small tendencies for psychotics to be more radical, unrestrained, undisciplined, impulsive, suspicious and assertive although these 15FQ™ dimensions would only reflect peripheral aspects of EPQR psychoticism. The I₇ scales generally share less in common with 15FQ™ than the EPQR although some meaningful associations exist. For instance, Impulsivity correlates best with 15FQ™ Enthusiastic whereas I₇ Venturesomeness correlates positively with 15FQ™ Assertive, Enthusiastic and negatively with Restrained. I₇ Empathy is related to 15FQ™ dimensions: Self-doubting, Restrained and low scores on Assertive.

The Relationship Between the 15FQ™ Scales and Kline's PPQ

A sample of 193 volunteers completed both the 15FQ™ and the PPQ as part of a test validation exercise. PPQ is based on the 5 Factor Model and as such provides a good test of whether 15FQ™ covers the same personality trait space proposed by Costa and McCrae (1985). Results in the table below are disappointing in that only moderate correlations were obtained between 15FQ™ and relevant PPQ factors. However, for the most part, good discrimination was obtained, in that the best statistical relationships were found to be meaningful and supportive of the 15FQ™ structure. PPQ Extraversion measure was best related to 15FQ™ Enthusiastic. PPQ Conscientious was correlated with 15FQ™ Conscientious and Disciplined (both contributing to 15FQ™ factor Control). PPQ Unconventional factor related best to 15FQ™ Radical and PPQ Tender-minded was positively associated with 15FQ™ Intuitive. Less than optimal discrimination was observed, between PPQ Insecurity and relevant 15FQ™ dimensions. From the correlational data reported above, PPQ Insecurity appears to be a better measure of social restraint than anxiety in 15FQ™ terms. This is reflected by high positive correlations with PPQ Insecurity and 15FQ™ Restrained, and negative associations with 15FQ™ Outgoing, Enthusiastic, Assertive and Socially Bold.