I am doing a statistical analysis in R. I made a lmer() model, in which a variable has 4 levels (1,2,3,4). The script sets up a contrast matrix for these levels. Basically, The main hypothesis is set up as:
Contrast: 4>3 4>2 4>1
As my study was exploratory, I was also curious of the remaining couples, and I "switched" the contrasts in order to get information about:
3>2 3>1 2>1
When I say that I "switched" the contrasts, I mean that I run the exactly same analysis by "substituting" some levels in the contrast matrix above. This because I noticed that different matrices didn't produce any change for the same contrasts, so I thought it didn't introduce any error.
Can I do that?