If you run an ANOVA and find that there are significant interactions, do you then pull the variables out individually and re-run the ANOVA?
I am using Type III. I want to see if there is a difference in survival between 3 groups, but I have to include 3 variables other than group in my model to make sure they didn't influence survival as well. When I do that A affects survival, and so do A*D and A*E, but when I run A, D, and E by themselves, nothing affects survival.
I wish had a better grasp on stats, because I am still so confused. In essence, I am looking at how survival differed between 3 groups of animals while taking into account that length, weight, and age may have played a role. When I look at these factors individually, none had a significant effect on survival...but, when I include interaction terms (i.e. length*weight, group*weight, etc.) the variables are significant. What does this mean? Am I wrong to put in my results that x,y, and z do not affect my results?