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A hierarchical IRT model for identifying group-level aberrant growth

As cheating on high-stakes tests continues to threaten the validity of score interpretations, approaches for detecting cheating proliferate. Most research focuses on individual scores, but recent events show group-level cheating is also occurring. …

Measuring reliability of student mastery classification at multiple levels

As the use of diagnostic assessment systems transitions from research applications to large-scale assessments for accountability purposes, reliability methods that provide evidence at each level of reporting must are needed. The purpose of this paper …

Using simulation to evaluate retest reliability of assessment results

As diagnostic assessment systems become more prevalent as large-scale operational assessments, consideration must be given to the method of reporting reliability. Alternatives to traditional reliability methods must be explored that are consistent …

Evaluating an initialization tool for student placement into a map-based assessment

Balancing test length with content targeted towards students' knowledge and skills is especially challenging when assessing students with significant cognitive disabilities. An initialization tool was developed to place students into map-based …