Dear all
I'm trying to set a one-way between-groups ANOVA with 2 or three covariates, but I'm having some troubles, can any one help me with this please?
I set a Full factorial design with 1 factor and 3 levels, and no mean scaling and no ANCOVA, is it right?
If so;
Lets suppose that I have a matrix for my 3 groups and 2 confounding variables:
groups zAge Gender
1 0 0 -0.56 1
1 0 0 -1.2 2
1 0 0 1.4 2
0 1 0 1.4 1
0 1 0 -0.86 1
0 1 0 -0.94 2
0 0 1 -1.2 2
0 0 1 1.4 1
0 0 1 -0.86 2
I've set an F contrast
[1 -0.5 -0.5
-0.5 1 -0.5
-0.5 -0.5 1] --> reducing the design for columns 4 & 5
Actually if I only set the columns for reduced design the contrast is set automatically, for which I interpret measures the same Fcontrast that I wrote.
or
3 t contrasts:
c1: [1 0 0]
c3: [0 1 0]
c3: [0 0 1]
what should I select in the "Null hyp. to assess"?
wich of these is correct to test the differences between any of the 3 groups?
Any help will be so appreciated
Thanks in advance
Gabriel