Differential Item Functioning: How We Eliminate Demographic and Cultural Bias

Equating Psychometric Norms Globally

Differential Item Functioning (DIF) occurs when test-takers from diverse demographic cohorts with the same latent trait score show divergent item response probabilities. Core16 enforces stringent Mantel-Haenszel and logistic regression DIF audits across 184,200 cohort instances.

The findings confirm non-discriminatory measurement validity in compliance with ISO 10667-1 and EEOC Uniform Guidelines, proving negligible DIF variance across global regions.