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Organizational Research Methods
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Testing Agreement for Multi-Item Scales With the IndicesrWG(J) and AD M(J)

Ayala Cohen

Technion Israel Institute of Technology, ieayala{at}ie.technion.ac.il

Etti Doveh

Technion Israel Institute of Technology

Inbal Nahum-Shani

Technion Israel Institute of Technology

The most popular index of agreement has been rWG(J); more recently, the ADM(J) index also has been used. This study addresses two problems: first, how to test the statistical significance of rWG(J) and ADM(J) and, second, how to infer from the indices that were evaluated for each group about the agreement of the ensemble of groups. The authors extend the inference based on either rWG(J) or ADM(J) by focusing on multiple-item scales and on the whole ensemble of groups. Their method is based on simulations, as was done by Dunlap, Burke, and Smith-Crowe (2003) and by Cohen, Doveh, and Eick (2001). The tests are illustrated on the data of Bliese, Halverson, and Schriesheim (2002) pertaining to a sample of 2,042 U.S Army soldiers in 49 U.S. Army companies. Software for our procedures is available both as a SAS code and in the Multilevel Modeling in R package (Bliese, 2006).

Key Words: indices of agreement • RWG • AD • multi-item scale • significance tests

This version was published on January 1, 2009

Organizational Research Methods, Vol. 12, No. 1, 148-164 (2009)
DOI: 10.1177/1094428107300365
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