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Full-Text Articles in Education

Simple Structure Mirt Equating For Multidimensional Tests, Stella Yun Kim May 2018

Simple Structure Mirt Equating For Multidimensional Tests, Stella Yun Kim

Theses and Dissertations

Equating is a statistical process used to accomplish score comparability so that the scores from the different test forms can be used interchangeably. One of the most widely used equating procedures is unidimensional item response theory (UIRT) equating, which requires a set of assumptions about the data structure. In particular, the essence of UIRT rests on the unidimensionality assumption, which requires that a test measures only a single ability. However, this assumption is not likely to be fulfilled for many real data such as mixed-format tests or tests composed of several content subdomains: failure to satisfy the assumption threatens the ...


Examining The Effects Of Changes In Automated Rater Bias And Variability On Test Equating Solutions, Michelle Boyer Jan 2018

Examining The Effects Of Changes In Automated Rater Bias And Variability On Test Equating Solutions, Michelle Boyer

Doctoral Dissertations

Many studies have examined the quality of automated raters, but none have focused on the potential effects of systematic rater error on the psychometric properties of test scores. This simulation study examines the comparability of test scores under multiple rater bias and variability conditions, and addresses questions of their effects on test equating solutions. Effects are characterized by a comparison of equated and observed raw scores and estimates of examinee ability across the bias and variability scenarios. Findings suggest that the presence of, and changes in, rater bias and variability affect the equivalence of total raw scores, particularly at higher ...