Evaluating Items Fairness in a College Admission Test of a Philippine University

This study looked into differential item functioning in a College Admission Test (CAT) of a Philippine University using the Rasch Model. The CAT covers language proficiency, science, mathematics, and reading comprehension. Logical data analysis was performed to determine which DIF items were biased. Of the 250 items, 94 or 37.6 % showed negligible DIF, 93 or 37.2 % displayed moderate DIF, and 63 or 25.2 % exhibited severe DIF. Of the 63 items with severe DIF, 13 were declared biased. Sources of bias were categorized into two: construct-irrelevant and construct-relevant variance. Revision or replacement of biased items is recommended.