Hi all,
I have been struggling with ANOVAs on R. I am new to R, so I created a simple
data frame, and I do some analyses on R just to learn R and then check them on
SPSS to make sure that I am doing fine. Here is the problem that I've run into:
when we use the aov function, it uses SS Type I as default (on SPSS it is Type
III). Then I used the Anova function under cars package using the command:
mod <- lm(DV
~ IV1*IV2, data = mydata,
contrasts=list(IV1=contr.sum,
IV2=contr.sum))
Anova(mod, type=â3â)
Above, both of my IVs are between-SS variables. But still, results from this
model do not match the results from SPSS (I have to say they are not too
different either). But I was wondering if I am doing something wrong. If what I
am doing is okay, then my next question is can I use the same set of commands
(for Anova function) if one of my IVs was within-SS and the other IV was
between-SS?
Thank you very much!
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