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Showing 1 to 6 of 6 for “"DIMTEST"”.
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Formulating a Dimtest-Based Effect Size Measure and a New DIMTEST Statistic and Their Applications
… interpretable effect size measure for use with DIMTEST, a widely used method for testing the hypothesis of test unidimensionality as represented by local item independence. There are six chapters in this dissertation. Chapter 1 addresses the importance of assessing unidimensionality and provides …
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DIMTEST Enhancements and Some Parametric IRT Asymptotics
The joint consistency of item and ability parameter estimation remains a challenging problem in IRT parametric modeling. Although many simulation studies have been conducted on the item and ability parameter estimates obtained by joint maximum likelihood estimation which is implemented in LOGIST …
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New nonparametric statistical procedures for analyzing bias/DIF and dimensionality in item response data
… further and non-trivial practical refinement of DIMTEST(Stout, 1987; Nandakumar & Stout, 1993) is made to assess latent trait unidimensionality for mixed dichotomous and polytomous items. The modification is referred to Poly-DIMTEST. The new test statistic for polytomous item scoring was …
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Assessing The Dimensionality of Polytomous Item Exams
… currently existing methods, the original Poly-DIMTEST (Li & Stout, 1995; Nandakumar et al., 1998), and the polytomous extension of DIMTEST without AT2 (Froelich, 2000).</p> <p>The first step in using Poly-NEWDIM is to decide on the AT and PT subtests. The proposed two new AT-selection …
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A new dimensionality estimation tool for multiple-item tests and a new DIF analysis paradigm based on multidimensionality and construct validity
… measures with Hierarchical Cluster Analysis and DIMTEST to estimate the dimensionality structure of tests. The results of simulation studies and real data analyses indicate that the new tool represents a significant step forward in the ability of dimensionality assessment tools to identify …
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Questioning the Information Subtest of the Wais-R: Dimensionality, DIF and DBF Analysis, and the Assessment of Category-Specific Semantic Memory Disturbances in Unilaterally Brain -Lesioned Patients
… Stout (1987, 1990) and its associated statistic, DIMTEST, the subtest was found to be multidimensional for all three examinee groups. In contrast, a factor analytic investigation of the subtest revealed a unidimensional underlying structure for all three groups. DIF and DBF were conceptualized …