Recent issues regarding r WG, r* WG, r WG(J), and r* WG(J)

James M. LeBreton, Lawrence R. James, Michael K. Lindell

Research output: Contribution to journalArticlepeer-review

93 Scopus citations


A recent article by Lindell and Brandt raised two concerns regarding the use of James, Demaree, and Wolf's interrater agreement indices r WG and r WG(J). First, they noted that the multi-item r WG(J) equation is mathematically equivalent to inserting r WG into the Spearman-Brown prophecy formula and questioned whether applying a formula developed for a reliability index was also appropriate for an agreement index. Second, they questioned the appropriateness of James et al.'s suggestion of replacing obtained negative values of r WG with zeros. This article addresses these concerns by demonstrating that r WG(J) can be derived independently from the Spearman-Brown prophecy formula and that negative values of r WG can be avoided by reparameterizing the structural equation underlying the data when there is systematic disagreement between subgroups of raters.

Original languageEnglish (US)
Pages (from-to)128-138
Number of pages11
JournalOrganizational Research Methods
Issue number1
StatePublished - Jan 2005

All Science Journal Classification (ASJC) codes

  • Decision Sciences(all)
  • Strategy and Management
  • Management of Technology and Innovation


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