One last question.
I am doing a one-way ANOVA with three independent groups (HCC, LCC, and SZ). All I want to know is what are the omnibus differences among the three groups, but I want to do this while "controling/adjusting " for the effect of Age.
Do I need to specify this in a glt code?
If so, is this correct?
-gltLabel 1 GROUP -gltCode 1 'Grp : 1*HCC -1*LCC -2*SZ Age : '
I'm not really clear what -2 multiplied by the SZ group means but I can't figure out how else to put all three groups in the comparison.
Thanks!