Usage Note 37928: When fitting a model with random effects, are the effects tested correctly?
When fitting a model with random effects using the expected mean squares method, JMP® is testing the effect correctly. The "Test Denominator Synthesis" output might be different than what you think it should be. However, JMP is following the references of Hocking and Hartley and Searle (listed below) to determine the appropriate error terms in models with random effects. This issue is an item of controversy among statisticians and relates to the formulation and parameterization of the model.
- Hocking, R.R. (1973), "A Discussion of the Two-Way Mixed Model," The American Statistician, 27: 148-152.
- Hartley, H.O. and Searle, S.R. (1969), "A Discontinuity in Mixed Model Analysis," Biometrics, 25: 573-576.
Operating System and Release Information
|Product Family||Product||System||SAS Release|
|JMP Software||JMP software||Macintosh|
|Microsoft Windows Server 2003 Enterprise 64-bit Edition|
|Microsoft Windows XP 64-bit Edition|
|Microsoft® Windows® for x64|
|Microsoft Windows 2000 Professional|
|Microsoft Windows Server 2003 Standard Edition|
|Microsoft Windows XP Professional|
|Linux for x64|
|Date Modified:||2009-11-20 12:26:44|
|Date Created:||2009-11-20 10:03:47|