[R-sig-ME] GLMM parameter interpretation

Adam Smith raptorbio at hotmail.com
Fri Jan 20 05:22:00 CET 2012


All,

A quick question, and an easy one I expect.

Suppose the following generic overdispersed log-linear model:

Count ~ A + B + C + (1|level1) + (1|level2) + (1|obs)

A, B, and C are all factors.
A does not vary within level1 subjects.
B does not vary within level2 subjects.
C varies within level 1 and level 2 subjects.

Does the conditional nature of the GLMM and the lack of variation in A (within level 1 subjects) and B (within level 2 subjects) result in nonsensical or uninterpretable coefficients for these two covariates?

Thanks,

Adam Smith
Dept. Natural Resources Science
105 Coastal Institute in Kingston
University of Rhode Island
 		 	   		  



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