Doctoral Dissertations

Date of Award


Degree Type


Degree Name

Doctor of Philosophy



Major Professor

R. Steve McCallum

Committee Members

Robert Williams, Sherry Bain, Robert Saudargas


In order to determine the concurrent and predictive validity of the Universal Nonverbal Intelligence Test- Group Ability Test (UNIT-GAT; McCallum & Bracken, in press), the UNIT-GAT and the Naglieri Nonverbal Ability Test (NNAT; Naglieri, 1997a) were administered in counter-balanced order to 93 students. In addition, 40 students were rated on the Universal Nonverbal Intelligence – Gifted Screening Scales (UNIT-GSS; McCallum & Bracken, in press). The correlation coefficient of r = .36 between the UNITGAT total raw score and the NNAT was statistically significant at the p < .01 level. The UNIT-GAT scale score correlations with the NNAT total ranged from r = .18 for the Symbolic Scale to r= .53 (p< .01) for the Nonsymbolic Scale. The UNIT-GAT total raw score correlations with the UNIT-GSS composite and scales ranged from r = -.06 between both the Emotional and Science scales to r = .19 on the Creative Scale. None of the correlations were statistically significant. The correlations between the scales of the UNIT-GAT and composites of the UNIT-GSS ranged between r= -.05 (UNIT-GAT Memory Scale and UNIT-GSS General Aptitudes Composite) to r = .20 (UNIT-GAT Reasoning Scale and UNIT-GSS General Aptitudes Composite). Correlations between the scales of the UNIT-GAT and the scales of the UNIT-GSS ranged from r = -.30 between the UNIT-GAT Memory Scale and UNIT-GSS Emotional Scale to r = .25 between the UNIT-GAT Nonsymbolic Scale and UNIT-GSS Creative Scale.

Stepwise multiple regression analysis did not reveal any significant utility by the UNIT-GAT total raw score or the NNAT total raw score to predict teacher-ratings on the UNIT-GSS General Aptitude and Specific Academic Aptitude Composites. Implications and future directions for research are discussed.

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