Development of the Hamdan Giftedness Test: Psychometric Analysis Strategies According to Advanced Global Models (Rasch Model)

Authors: Prof. Dr. Alaa Eldin Abdel Hamed Ayoub

Conference: 2nd World Giftedness Center International Conference

Keywords:  Standards table, Estimated abilities, Statistical analysis

Abstract

Development and Psychometric Assessment of the Hamdan Cognitive Ability Test Using the Rasch Model

This study explores the psychometric analysis of the Hamdan Giftedness Test, a comprehensive cognitive ability assessment developed to identify gifted students across the UAE. The test includes five core cognitive skills tests: Verbal Ability I (semantic processing), Science Pre-knowledge (conceptual reasoning), Verbal Ability II (comprehension), Mathematics Pre-knowledge (quantitative reasoning), and Nonverbal Ability. These components are tailored for four educational stages: Grades 4–6, 7–8, 9–10, and 11–12.

A total of 12,071 students (4009 males and 8062 females) from all seven emirates participated. Through advanced psychometric assessment methods, particularly the Rasch model, the study examined item reliability, validity, item calibration, and differential item functioning (DIF). Tools such as standardized residual variance and residual correlations were applied to detect item dependency. Missing data were addressed through Rasch-based difficulty estimations.

The final output included percentile norms, raw-to-ability score conversions, and cut-off scores to support precise gifted identification. These findings highlight the test’s effectiveness as a modern cognitive intelligence test, grounded in international psychometric standards.