Developing homogeneous TOEFL scales by multidimensional scaling  

Oleh:

Oltman, Philip K. ; Stricker, Lawrence J.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Language Testing (Full Text & ada di PROQUEST dari th 1998 - terbaru) vol. 7 no. 1 (Jun. 1990), page 1-12.
Fulltext: 1.pdf (563.48KB)

Isi artikel

A recent multidimensional scaling analysis of item response data for the TOEFL identified clusters of items in the test sections and suggested that these clusters might be more homogeneous and more distinct than their parent sections, and hence better suited for diagnostic use. The present study explored the feasibility and value of using such cluster scores. The original analysis was based on all the item responses (choosing one of the four alternatives, or omitting or not reaching an item). That analysis was repeated, this time using the traditional scoring of item responses as correct or incorrect. Scores were then obtained for the clusters identified in the new analysis. The new dimensions and clusters were similar to the old ones. The corresponding scores for the clusters and the test sections did not differ in their internal-consistency reliabilities and intercorrelations for the total sample, but diverged inconsistently for high- and low-scoring examinees.

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