[R-sig-ME] post hocs for LMMs / GLMMs

Kay Cecil Cichini Kay.Cichini at uibk.ac.at
Wed May 19 09:52:05 CEST 2010

..."different parameterizations" may be the wrong term, as the 
parameters actually stay the same and i only change the intercept-level.

Kay Cecil Cichini schrieb:
> hello,
> i have several LMMs and GLMMs with 2 nominal fixed factors, f1: A,B,C,D 
> and f2: 1,2. now i need inference on the differences of level 1 vs. 2 of 
> f2 within each level of f1, or vice versa differences of A/B, A/C, A/D, 
> B/C, etc. within each level of f2.
> before i try with glht(): isn't it justified to examining the model's 
> t-tests with re-ordered levels of the nominal variables, by
> which each of this comparisons can be yielded by the different
> parameterizations - this seems to be the most convenient way and till 
> now i found no one to explain to me why this may or may not be valid.
> best regards,
> kay
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