I just had a curiousity about interpretting a test slice result. I have data collected that is repeated over multiple days but my main interest is what occured within each day which is why I use the test slice.  Lets say I have this in the slice for a day:
 
Level 1      -1      -1      -1
Level 2       1      
Level 3                1
Level 4                          1
 
If I am thinking of this correctly this is only testing Level 1 vs. Level 2,  Level 1 vs. Level 3, Level 1 vs. Level 4 but it is not testing interactions between the other levels and I am interested in all of the interactions among the levels within each day and knowing if there is any difference. So what is the best way to achieve this?