Implications of Test Dimensionality for Un - Dimensional IRT Scoring : An Investigation of A High - Stakes Testing Program  

Oleh:

Oppler, Scott H. ; Childs, Ruth A.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 60 no. 6 (2000), page 939-955.
Topik: investigations; tests; statistical methods
Fulltext: 939.pdf (103.83KB)

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: EE30.6 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Determining whether a test violates the assumption of uni dimensionality is an important precursor to item response theory (IRT) analysis. However, a test's unidimensionality or non unidimensionality may depend on how the test is analyzed and how the results are to be used. This study examined the dimensionality of a high - stakes graduate training selection test and the implications of the test's dimensionality for the IRT calibration and scoring of each section of the test. The dimensionality analyses suggested that, although the items within each of the sections were not completely homogeneous, neither were they clearly measuring distinct constructs corresponding to the content disciplines. The correlation between student scoers based on item parameters that were estimated separately within discipline and then formed into weighted composited and scores based on item parameters that were estimated across discipline (within section) exceeded 0,99.

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