ITEM DIMENSIONALITY EXPLORATION BY MEANS OF CONSTRUCT MAP AND CATEGORICAL PRINCIPAL COMPONENTS ANALYSIS

TitleITEM DIMENSIONALITY EXPLORATION BY MEANS OF CONSTRUCT MAP AND CATEGORICAL PRINCIPAL COMPONENTS ANALYSIS
Publication TypeJournal Article
Year of Publication2019
AuthorsDeliu, G, Miron, C, Opariuc-Dan, C
JournalJournal of Baltic Science Education
Volume18
Issue2
Start Page209-226
PaginationContinuous
Date PublishedApril/2019
Type of ArticleOriginal article
ISSN1648-3898
Other NumbersE-ISSN 2538-7138
Keywordscategorical principal components analysis, construct map, item response theory, unidimensionality
Abstract

The aim of this research is to study the merits and complementarity of Construct Mapping and Categorical Principal Components Analysis as two approaches that explore the dimensionality of multiple-choice items in achievement tests. Data from the two forms of the Romanian National Assessment Tests on Science were used to explore the dimensionality of items and to identify potentially problematic items that affect the equivalence of the two parallel forms. The findings confirm that the two tests have at best partial equivalence, but while the two methods both agree on test unidimensionality, they flag in part different items as potentially problematic. The results enable researchers and practitioners to make coherent data-driven decision regarding the use of unidimensional vs multidimensional IRT models.

URLhttp://oaji.net/articles/2019/987-1554359543.pdf
DOI10.33225/jbse/19.18.209
Refereed DesignationRefereed
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