Some of my 3dLME outputs are identical, despite coding for non-overlapping groups. I have a suspicion that this has something to do with the way the glt coding is interacting with the specified model. I’m trying to compare, within a disease group, the longitudinal differences between genetic groups.
-model ‘AgeGenetics+AgeDX’ \
these tests among others:
-gltLabel 33 ‘Age_AD_Mut-WT’ -gltCode 33 'Genetics : 1Mut -1WT DX : 1AD Age : ’
-gltLabel 34 ‘Age_CN_Mut-WT’ -gltCode 34 'Genetics : 1Mut -1WT DX : 1CN Age : ’
have the same output as this test:
-gltLabel 25 ‘Age_Mut-WT’ -gltCode 25 'Genetics : 1Mut -1WT Age : ’ \
so obviously, the specification of the DX group is failing. Is this because I do not have DX:Genetics in the model? The AgeDXGenetics model fails, on reading rhe messageboards I believe this is because every subject always has the same for both DX and genetics. Or is there some limitation or have I not properly understood how to use complex tests in LME?