A Unified Approach to Linear Equating for the Nonequivalent Groups Design  

Oleh:

Davier, Alina A. von ; Nan, Kong

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal Of Educational And Behavioral Statistics vol. 30 no. 3 (2005), page 313-342.
Topik: chain linear equating; delta method; Levine observed-score equating; nonequivalent groups anchor test (NEAT) design; standard error of equating; test equating; Tucker equating
Fulltext: 313.pdf (594.86KB)

Isi artikel

This article describes a new, unified framework for linear equating in a nonequivalent groups anchor test (NEAT) design. The authors focus on three methods for linear equating in the NEAT design—Tucker, Levine observed-score, and chain—and develop a common parameterization that shows that each particular equating method is a special case of the linear equating function in the NEAT design. A new concept, the method function, is used to distinguish among the linear equating functions, in general, and among the three equating methods, in particular. This approach leads to a general formula for the standard error of equating for all linear equating functions in the NEAT design. A new tool, the standard error of equating difference, is presented to investigate if the observed difference in the equating functions is statistically significant.

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