Congeneric and (Essentially) Tau-Equivalent Estimates of Score Reliability: What They Are and How to Use Them  

Oleh:

Graham, James M.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 66 no. 06 (Dec. 2006), page 930-944.
Topik: reliability; structural equation modeling; congeneric; tau-equivalent
Fulltext: 930.pdf (115.84KB)

Isi artikel

Coefficient alpha, the most commonly used estimate of internal consistency, is often considered a lower bound estimate of reliability, though the extent of its underestimation is not typically known. Many researchers are unaware that coefficient alpha is based on the essentially tau-equivalent measurement model. It is the violation of the assumptions required by this measurement model that are often responsible for coefficient alpha’s underestimation of reliability.This article presents a hierarchy of measurementmodels that can be used to estimate reliability and illustrates a procedure by which structural equation modeling can be used to test the fit of thesemodels to a set of data.Test and data characteristics that can influence the extent to which the assumption of tau-equivalence is violated are discussed. Both heuristic and applied examples are used to augment the discussion.

Opini Anda

Klik untuk menuliskan opini Anda tentang koleksi ini!

Kembali