Rebecca Stewart wrote:
> I am running a 2-way ANOVA using the general linear model (univariate)
> and my omnibus test indicates I have an interaction. I want to do
> post-hoc tests on this interaction, but when I click on the post-hoc
> tab, my only choices are only to get post-hoc tests for my 2 IVs - the
> interaction is not there. How do I compute post-hoc tests on my
> interaction?
For a 2x2 factorial design, it is quite easy. See this example:
INPUT PROGRAM.
NUMERIC Diet Strain ACholine (F8).
DATA LIST/#N 1 Diet 3 Strain 5.
REPEATING DATA STARTS=6 /OCCURS=#N /DATA ACholine 1-4.
END INPUT PROGRAM.
BEGIN DATA
8 1 1 528 444 338 342 338 331 288 319
8 2 1 434 472 331 444 312 575 575 384
9 1 2 294 175 254 241 352 238 241 269 291
9 2 2 272 388 275 425 350 344 350 425 466
END DATA.
VAR LABEL Strain 'Mouse strain' /ACholine 'AcetylCholine levels'.
VAL LAB Diet 1 'Standard' 2 'Apple'
/Strain 1 'BalbC' 2 'Alzheimer'.
VAR LEV Diet Strain (NOMINAL).
UNIANOVA ACholine BY Diet Strain
/LMATRIX="Diet effects"
Diet*Strain -1 0 1 0 Diet -1 1;
Diet*Strain 0 -1 0 1 Diet -1 1
/LMATRIX="Strain effect"
Diet*Strain 1 -1 0 0 Strain 1 -1;
Diet*Strain 0 0 1 -1 Strain 1 -1
/DESIGN = Diet Strain Diet*Strain .
HTH,
Marta García-Granero
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