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There has been an increasing interest in implementing cognitive diagnostic models (CDMs) in operational assessments among researchers and practitioners. Operational CDMs require accurate and efficient parameter estimations. In this paper, we introduce two parameter estimation methods—the minimum discrepancy (MD) and the minimum discrepancy maximum likelihood (MDML)—in the context of CDMs. Both methods...
This study explored potential sources of differential item functioning (DIF) among accommodated and nonaccommodated groups by examining skills and cognitive processes hypothesized to underlie student performance on the National Assessment for Educational Progress (NAEP). Out of 53 released NAEP items in 2007 for grade 8, a total of 25 items were flagged as DIF among the four studied groups (nonaccommodated,...
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